A 20.0-mL sample of 0.150 M KOH is titrated with 0.125 M HClO4 solution. Calculate the pH after the following volumes of acid have been added.
d) 27.0 mL of the acid
Answers
Answer:
1.14
Explanation:
This is a neutralization reaction between KOH and HClO4, which can be represented by the following balanced chemical equation:
KOH + HClO4 → KClO4 + H2O
Before any HClO4 is added, the 20.0-mL sample of 0.150 M KOH contains:
moles of KOH = M × V = 0.150 mol/L × 0.0200 L = 0.00300 mol
Since the balanced chemical equation has a 1:1 stoichiometric ratio between KOH and HClO4, 0.00300 moles of HClO4 will be required to completely react with the KOH.
When 27.0 mL of 0.125 M HClO4 is added, the total volume becomes:
V_total = V_initial + V_added = 20.0 mL + 27.0 mL = 47.0 mL
The moles of HClO4 added can be calculated as:
moles of HClO4 = M × V = 0.125 mol/L × 0.0270 L = 0.00338 mol
Since the reaction is 1:1, this means that 0.00338 mol of KOH has been neutralized.
The moles of KOH remaining can be calculated as:
moles of KOH remaining = 0.00300 mol - 0.00338 mol = -0.00038 mol
This negative value indicates that all of the KOH has been neutralized and there is an excess of HClO4. Therefore, we need to calculate the pH of a solution of HClO4.
The concentration of HClO4 after 27.0 mL has been added can be calculated as:
M = moles of HClO4 / V_total = 0.00338 mol / 0.0470 L = 0.0719 M
The pH of this solution can be calculated using the equation:
pH = -log[H+]
Where [H+] is the concentration of hydrogen ions in the solution.
HClO4 is a strong acid, which means that it completely dissociates in water to form H+ and ClO4- ions. Therefore, the concentration of hydrogen ions in a 0.0719 M solution of HClO4 is equal to the concentration of HClO4:
[H+] = 0.0719 M
The pH can then be calculated as:
pH = -log[H+] = -log(0.0719) = 1.14
Therefore, the pH after 27.0 mL of 0.125 M HClO4 has been added to a 20.0-mL sample of 0.150 M KOH is 1.14.
Related Questions
A formula that shows how many atoms of each element a substance contains is called a(n) ____.
A. ionic formula
B. molecular formula
C. structural formula
D. empirical formula
Answers
Answer:
c
Explanation:
A formula that shows how many atoms of each element a substance contains
what traits or traits did the plants in the F generation exhibit when you think of the traits of the parent plants why is the result surprising.
Answers
The traits that the offspring got were taken from the parents.
How do offspring's get traits?Offspring get traits from their parents through the process of inheritance. Traits are determined by genes, which are segments of DNA that contain the instructions for building and maintaining an organism's body and traits.
Each parent contributes half of their genes to their offspring through their gametes, which are reproductive cells such as sperm and eggs. When a sperm fertilizes an egg, the resulting zygote has a complete set of genes from both parents.
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explain how ships made of steel float on water
Answers
Answer:
The air that is inside a ship is much less dense than water. That's what keeps it floating
what carbonyl compound and alcohol are formed by hydrolysis of each acetal
Answers
Acetals can be hydrolyzed using catalytic acid to produce a carbonyl compound and alcohol. If the acid concentration is increased, acetal can be hydrolyzed back to its initial aldehyde or ketone form.
This mechanism occurs in the opposite direction of the acetal formation mechanism. The hydrolysis of each acetal generates a carbonyl compound and an alcohol.What are Acetals?Acetals are organic compounds that are formed by the reaction of an aldehyde or ketone with two molecules of alcohol, and they have the following general structure: R1R2C(OR')2.Acetals can be regarded as derived from hemiacetals, which are formed by the reaction of an aldehyde or ketone with one molecule of alcohol.The carbonyl carbon in an acetal is bonded to two alkoxide (OR) groups, while the carbonyl carbon in a hemiacetal is bonded to only one. As a result, acetals are more stable than hemiacetals. Acetals are widely used in organic synthesis, including as protecting groups for carbonyl groups in reactions that would otherwise destroy them.Example:Acetal hydrolysis occurs when an acid catalyst is used to cleave the two ether bonds in the molecule. When an acetal is hydrolyzed with an acid catalyst such as H2SO4, a carbonyl compound and an alcohol are formed.Example:H2SO4 is added to the acetal, which hydrolyzes it, producing an aldehyde or ketone and two alcohol molecules. For example, if dimethyl acetal is hydrolyzed, it will yield acetone and two methanol molecules.
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What is an atom of Gold's mass number if it has 111 neutrons?
Answers
Answer:
190
Explanation:
Gold has atomic number of 79, which is the number of protons.
Mass number = #protons + #neutrons = 79 + 111 = 190
when using the ideal gas equation, if the numerical value of r is 0.08206, then ________.
Answers
When using the ideal gas equation, if the numerical value of R is 0.08206, then the units of the gas constant (R) are L atm/mol K.
The ideal gas equation is PV=nRT, where P represents pressure, V is volume, n is the number of moles of the gas, R is the gas constant, and T is the temperature in Kelvin.
Let's break down the units of each term in the ideal gas equation:
P: Pressure is typically measured in units of atmospheres (atm) in this context.
V: Volume is commonly measured in liters (L).
n: The number of moles (n) is a unitless quantity representing the amount of substance.
T: Temperature is measured in Kelvin (K).
By substituting the units into the ideal gas equation, we have:
(L atm) = (mol) × (L atm/mol K) × (K)
Since both sides of the equation must have the same units, the units of the gas constant (R) are L atm/mol K.
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what current is required to produce 91.6 g of chromium metal from chromium(vi) oxide in 12.4 hours?
Answers
A current of 2.41 A is required to produce 91.6 g of chromium metal from chromium(VI) oxide in 12.4 hours.
The calculation to determine the required current to produce a certain amount of chromium metal from chromium(VI) oxide involves using Faraday's law, which relates the amount of substance produced to the current and time. The molar mass of Cr2O3 is 151.99 g/mol, and the reduction of Cr2O3 to Cr involves the transfer of six electrons per mole.
Using these values and Faraday's constant (96,485 C/mol e-), we can calculate the required current as follows:
Calculate the number of moles of Cr2O3:
91.6 g / 151.99 g/mol = 0.603 mol
Calculate the amount of charge needed to reduce the Cr2O3:
6 mol e- / mol of Cr2O3 x 0.603 mol x 96,485 C/mol e- = 350,409 C
Calculate the current required:
350,409 C / (12.4 h x 3600 s/h) = 2.41 A
Therefore, a current of 2.41 A is required to produce 91.6 g of chromium metal from chromium(VI) oxide in 12.4 hours.
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What is the independent variable in an experiment?
A)
The variable that remains the same throughout the
experiment.
B)
The variable being tested in the experiment.
C)
The variable being measured in an experiment.
2. what type of variable should there only be one of in an experiment?
a. dependent
b. independent
c.control
d. responding
An example of International system of measurement unit is:
a. pound
b. mile
c.liter
d.ounce
Answers
what is a mixture of elements and compounds
Answers
The substance in the image above would be classified as a mixture of elements (option E).
What is a compound and mixture?A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.
On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.
According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.
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1. When an area is shown to have high
pressure on a weather map, what can typically be expected?
A. clear skies and clear weather
B. dark clouds and wet weather
C. overcast skies and clear weather
Answers
Answer:
On number 2.
its c
Answer:
1. A) 2. D) 4. A)
Explanation:
Why can't scientists simply use carbon-12 (12C) do determine
the age of dead carbon-based life forms?
Answers
Answer:
carbon-12 is not radioactive
Explanation:
The measurement of the age of dead carbon based life forms requires the use of a radioactive isotope hence it is often referred to as radiocarbon dating.
Carbon-12 and Carbon-14 occur together in living things.The half life of Carbon-14 is about 5670 years.
Hence, since Carbon-12 is not radioactive, it can not be used to measure the age of dead carbon based materials.
The distribution of grades on a final exam
line graph
scatter plot
bar graph
histogram
I'll give brainliest
Answers
Answer:
Histogram
Explanation:
mg(s) + 2hcl(aq) mgcl2(aq) + h2(g)
Please give me a real answer please!
Answers
In this reaction Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) Magnesium acts as a reducing agent.
Only question should be of 4 or answer of other questions should also be there.
2. Calculate the mass (m) of the hydrated calcium chloride CaCl2.6H20.
Answers
Answer:
Explanation:Ca=40
Cl=35.5
cacl2.2h2o=147
2h2o=36
36/147=0.245%
How many moles of KNO3 are in 500.0 mL of 2.0 M KNO3?
Answers
There is 1.0 mole of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution.
To determine the number of moles of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution, we need to use the equation:
moles = concentration (M) × volume (L)
Since 1 liter is equal to 1000 milliliters, we divide 500.0 mL by 1000 to get 0.5 L.
Next, we substitute the values into the equation:
moles = 2.0 M × 0.5 L
The concentration of 2.0 M indicates that there are 2.0 moles of KNO₃ in 1 liter of the solution. Therefore, multiplying the concentration (2.0 M) by the volume (0.5 L) gives us the number of moles of KNO₃:
moles = 2.0 M × 0.5 L = 1.0 mol
Hence, there is 1.0 mole of KNO3 in 500.0 mL of a 2.0 M KNO₃ solution.
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which of the following accurately describes the ph scale? which of the following accurately describes the ph scale? the ph scale runs from 0 (neutral) to 14 (most acidic), with 7 as an average acidity level. the ph scale runs from 0 (most acidic) to 14 (neutral), with 7 as an average acidity level. the ph scale runs from 0 (most basic) to 14 (most acidic), with 7 as a neutral. the ph scale runs from 0 (most acidic) to 14 (most basic), with 7 as a neutral.
Answers
Answer:
The pH scale measures acidity of a substance. known as potential of hydrogen, it varies from 0 to 14 with 7 being the pH value of a neutral solution. Below 7 shows the substance is acidic in nature and above 7 is alkaline in nature. pH 0-3 are considered strong acids while pH 4-6 are weak acids. pH 8-10 are weak alkalines and pH 11-14 are strong alkalines. This is a general trend and there may be exeptions especially if the substance has a negative pH. However, it would not be covered likely unless you are doing university chemistry.
This gland of the endocrine and digestive systems produces insulin to help control the body's sugar levels and enzymes which aid in digestion.
Answers
Answer:
Pancreas.
Explanation:
Living systems are self-organized life forms and are known to be very much interactive with their surroundings or environment. Also, living systems are dependent on the flow of information, matter and energy at various levels.
Some examples of living systems in organisms are respiratory system, nervous system, digestive system, and circulatory system.
Additionally, living systems comprises of the following components; cells, organs, muscle, tissues, blood, etc.
An endocrine system refers to a series of ductless glands and organs responsible for the production and secretion of hormones that are used by the body for the performance of various functions such as metabolism, controlling growth, reproduction, mood, sleep, etc. These hormones are secreted directly into the circulatory system (blood) and then transported to the organs and tissues in the body.
Pancreas is one of the glands of the endocrine and digestive systems that produces insulin to help control the body's sugar levels and enzymes which aid in digestion.
This is my 6th time posting this questions. please not bots or links
and please *explain* the answer and steps
I really need help understanding this.
describe the process to determine the limiting reactant in the example listed below:
Given 3.4 grams of x element with a molar mass of 24 g/mol and 4.2 grams of y element with a molar mass of 35 g/mol. How much of compound xy2 can be generated?
x + 2y -> xy2
Answers
The amount of the compound \(XY_2\) that can be generated would be 11.28 grams
Stoichiometric calculationFrom the equation of the reaction, the mole ratio of X and Y is 1:1.
Mole of 3.5 grams of X = 3.4/24 = 0.1417 moles
Mole of 4.2 grams of Y = 4.2/35 = 0.12 moles
Thus, Y is the limiting reactant because it is present in a lower amount than needed.
Mole ratio of Y and \(XY_2\) = 1:1
Equivalent mole of \(XY_2\) = 0.12 moles
Molar mass of \(XY_2\) = 24 + (35x2) = 94 g/mol
Mass of 0.12 moles of \(XY_2\) = 0.12 x 94 = 11.28 grams
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2. How many mi hr is 30km/s?
Answers
The answer is 67 108.0888km/s.
Describe polar and nonpolar molecules
Answers
Answer:
Polar molecules occur when there is an electronegativity difference between the bonded atoms. Nonpolar molecules occur when electrons are shared equal between atoms of a diatomic molecule or when polar bonds in a larger molecule cancel each other out.
Explanation:
hope it's helps
1. How were matter and energy conserved in each demonstration?
Answers
Matter and energy are conserved in nature through their use by biological systems, which is dedicated by the Law of conservation.
What does matter and energy conservation mean?Matter and energy conservation indicate that organisms can not create or destroy these elements in nature.
Matter and energy conservation are fundamental for maintaining the state of equilibrium (homeostasis) of biological systems.
In conclusion, matter and energy are conserved in nature through their use by biological systems, which is dedicated by the Law of conservation.
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An old refrigerator is rated at 500 W how many kilowatt hours of electric energy what does refrigerator use in 30 days assume the refrigerator is running 12 hours per day
Answers
The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.
Given:
Power rating of the refrigerator = 500 W
Running time per day = 12 hours
Number of days = 30
First, we need to convert the power rating from watts to kilowatts:
Power rating = 500 W / 1000 = 0.5 kW
Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:
Energy used = Power rating × Running time × Number of days
Energy used = 0.5 kW × 12 hours/day × 30 days
Energy used = 180 kWh
Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.
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Ethylene, CH4, burns in oxygen to give carbon dioxide, CO2, and water. Write the equation for the reaction, giving molecular, molar, and mass interpretations below the equation.
Answers
The equation for the combustion reaction of ethylene (C2H4) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O) is:
C2H4 + 3O2 -> 2CO2 + 2H2O
The balanced equation represents the stoichiometry of the combustion reaction. Here is the interpretation of the equation:
Molecular Interpretation:
1 molecule of ethylene reacts with 3 molecules of oxygen to produce 2 molecules of carbon dioxide and 2 molecules of water.
Molar Interpretation:
1 mole of ethylene reacts with 3 moles of oxygen to produce 2 moles of carbon dioxide and 2 moles of water.
Mass Interpretation:
The molar masses of the compounds involved are:
C2H4: 2(12.01 g/mol) + 4(1.01 g/mol) = 28.05 g/mol
O2: 2(16.00 g/mol) = 32.00 g/mol
CO2: 1(12.01 g/mol) + 2(16.00 g/mol) = 44.01 g/mol
H2O: 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol
Therefore, when 28.05 grams of ethylene react with 96.00 grams of oxygen, they produce 88.02 grams of carbon dioxide and 36.04 grams of water.
The balanced equation C2H4 + 3O2 -> 2CO2 + 2H2O represents the combustion of ethylene with oxygen, resulting in the formation of carbon dioxide and water. The equation can be interpreted on a molecular, molar, and mass basis to understand the stoichiometry and quantities involved in the reaction. This information is useful for calculating reactant and product amounts, as well as for understanding the composition and yields of the combustion products.
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which sentence is a scientific statement
Answers
The scientific statement is
D. There is life on some other planet in the universe aside from Earth.
What is scientific statement?A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.
Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.
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complete question
Which sentence is a scientific statement?
A.
Food cooked in ceramic pots has a better aroma than food cooked in copper pots.
B.
A tall glass of water tastes better with a lemon wedge and ice cubes.
C.
Today, there are more viewers watching baseball than ice hockey on television.
D.
There is life on some other planet in the universe aside from Earth
Determine the mass of zirconium_______________, silicon__________________, and oxygen________________, found in 0.3384 mol of zircon, ZrSiO4, a semiprecious stone. Your answer must have the correct number of significant figures.Enter the number only, with no units.
Answers
1) Determine the mass of zirconium
Convert moles of zircon into moles of zirconium
\(\text{molesofZr}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofZr}}{1molofZrSiO_4}=0.3384\text{molesofZr}\)Convert moles of zirconium into mass of zirconium (g)
\(\text{gramsofZr}=0.3384\text{molesZr}\cdot\frac{91.224\text{ g Zr}}{1\text{molofZr}}=30.87\text{ g Zr}\)2) Determine the mass of Silicon
Convert moles of zircon into moles of silicon
\(\text{molesofSi}=0.3384molesofZrSiO_4\cdot\frac{1\text{molofSi}}{1molofZrSiO_4}=0.3384\text{molesofSi}\)Convert moles of silicon into mass of silicon (g)
\(\text{gramsofSi}=0.3384\text{molesofSi}\cdot\frac{28.085\text{ g of Si}}{1\text{molofSi}}=9.504\text{ g Si}\)3) Determine the mass of Oxygen
Convert moles of zircon into moles of oxygen
\(\text{molesofO}=0.3384molesofZrSiO_4\cdot\frac{4\text{molofO}}{1molofZrSiO_4}=1.3536\text{molesofO}\)Convert moles of oxygen into mass of oxygen
\(\text{gramsofO}=1.3536\text{molesofO}\cdot\frac{15.999\text{ g O}}{1\text{mol of O}}=21.66gO\)The mass of zirconium is 30.87 g
The mass of silicon is 9.504 g
The mass of oxygen is 21.66 g
How can you identify a coefficient and a subscript in a chemical equation?
Answers
Answer:
Explanation: Coefficients and Subscripts There are two types of numbers that appear in chemical equations. There are subscripts, which are part of the chemical formulas of the reactants and products; and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.
Every animal is composed of a collection of organs, allowing the animal to live. Animals have internal to external skeletons that allow which of the following functions for the animal?
Group of answer choices
Exchange gases
Protect from disease
Take in nutrients
Allow movement
Answers
Answer:
Allow movement
Explanation:
The skeleton provides structure and allows the body to move
Which of the following reagents might serve as the basis for a simple chemical test that would distinguish between pure 1-pentene and pure pentane? O BF3 O Br2 in ROOH, at ambient conditions O Br2 in CCl4, dark O More than one of these is correct. O NaNH2
Answers
Aqueous potassium permanganate that has been diluted with carbon tetrachloride with bromine. Pentane and 1-pentane are distinguished by reagents.
How is the test for unsaturation using bromine in a carbon tetrachloride solution conducted?An unsaturation test can be performed using the bromine in carbon tetrachloride solution. Use 100 ml of carbon tetrachloride and bromine to evaluate the unsaturation of a compound when it is insoluble in water. The bromine water turns gray as a result of how the bromine reacts with an alkene's carbon-carbon double bonds. With the help of bromine, an alkene is transformed into an alkane by breaking the carbon-carbon bond.
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be sure to answer all parts. show the mechanism of how the starting aldehyde is converted to the enol form using mechanism arrows and showing all intermediates. qs part 1 out of 3 finish structure ... leftrightharpoon
Answers
To convert an aldehyde to its enol form, a common mechanism is the tautomeric equilibrium involving keto-enol tautomerism.
Here is a step-by-step explanation of the mechanism:
1. Deprotonation. In the first step, a base, such as hydroxide ion (OH-), abstracts a proton from the alpha carbon of the aldehyde. This leads to the formation of an enolate anion. 2. Resonance stabilization. The negative charge on the oxygen atom of the enolate anion is delocalized to the alpha carbon, resulting in resonance stabilization. This is due to the formation of a double bond between the alpha carbon and the oxygen atom. 3. Tautomerization. The enolate anion can undergo tautomerization to form an enol. In this step, the pi electrons from the double bond move towards the oxygen atom, and a proton is transferred from the alpha carbon to the oxygen atom. This leads to the formation of a double bond between the alpha carbon and the oxygen atom, resulting in the enol form. Overall, the conversion of the starting aldehyde to the enol form involves deprotonation of the alpha carbon, resonance stabilization of the resulting enolate anion, and tautomerization to form the enol. It's important to note that the equilibrium between the keto and enol forms is dynamic, with the keto form being more stable. The relative amounts of the keto and enol forms depend on factors such as temperature, solvent, and the nature of the starting aldehyde.About AldehydeAldehyde is a synthetic, perfumed notes with an animalic, powdery or slightly dry woody scent, often used to enhance the floral notes of perfumes. Aldehyde fragrances are characteristic of a greenish, musky fragrance. Organic compounds are present in many natural materials, which can be synthesized artificially. In industry, their production is carried out by oxidation of methanol. Formaldehyde is known as formalin. This compound is used as a disinfectant, insecticide, preservative for corpses, and is used in the plastics industry.
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Coffee has a ph of approximately 5. 0. What results would you predict if we added lactase to a solution of milk and coffee? would glucose be produced? provide your rationale.
Answers
Lactose contains sugar and glucose, which is found in lactose, glucose will be formed when coffee is added to milk and then lactose is added to the coffee and milk combination.
Because milk contains calcium, it is white in colour and contains the known sugars lactose and glucose. Lactose, a type of sugar present in milk, turns into glucose when combined with coffee.
Farmers dry the brownish bean-shaped coffee seed, which is then ground into a fine powder and combined with milk and sugar to make coffee. In general, Brazil and other nations are where you may find coffee.
Because lactose contains sugar and glucose, when coffee is added to milk and then lactose is added to the coffee and milk solution, glucose will be created.
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