Calculate the ph m of the buffer when 85 ml of 0.13 m lactic acid is mixed with 95 ml of 0.08 m sodium lactate ka lactic acid

The pH of a .25 M acetic acid solution would be higher than the pH of a .25 M hydrochloric acid solution. This is because acetic acid is a weak acid, meaning it only partially dissociates in water, while hydrochloric acid is a strong acid, meaning it completely dissociates in water. The pH of a weak acid solution is higher than the pH of a strong acid solution of the same concentration.
Based on the terms you provided, I'll compare the pH of 0.25 M acetic acid and 0.25 M hydrochloric acid solutions.
Acetic acid is a weak acid, which means it doesn't completely dissociate in water, whereas hydrochloric acid is a strong acid, meaning it fully dissociates in water. When an acid dissociates, it releases hydrogen ions (H+) into the solution, which determines the pH.
Here's a step-by-step comparison:
1. A 0.25 M acetic acid solution will only partially dissociate, releasing fewer H+ ions into the solution.
2. A 0.25 M hydrochloric acid solution will completely dissociate, releasing more H+ ions into the solution.
Since the pH scale is logarithmic and inversely related to the concentration of H+ ions, a solution with fewer H+ ions will have a higher pH (less acidic) than a solution with more H+ ions.
Therefore, you would expect the pH of a 0.25 M acetic acid solution to be higher (less acidic) than the pH of a 0.25 M hydrochloric acid solution.

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To prepare a solution of  hcl(aq) with a volume of 675.0 ml and a concentration of 1.00 m from a concentrated solution of 11.5 m we need a volume of: 58.69 ml

To solve this problem, the formula and the procedure that we have to use is:

c1 * v1 = c2 * v2

Where:

Information about the problem:

Applying the dissolution of concentrations formula and clearing the volume of the concentrated solution (v1) we get:

c1 * v1 = c2 * v2

v1 = (c2 * v2)/ c1

v1 = (1.00 m * 675.0 ml)/ 11.5 m

v1 = 58.69 ml

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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Answer:

Mass and Volume

Explanation:

The formula for density is

\(\frac{Mass}{Volume}\)

Answer:

4. The amount of caffeine in the drinks

5. The heart rate of the participants of the experiments

6. Water

7. i) The volume of drink taken should be constant

ii) The frequency of taking their drink is constant

iii) The time of drinking by the brothers is constant

Explanation:

In the question, Jeffery intends to find the caffeine drink that will result in the heart rate increasing most

The variables (varieties) of drinks tested by Jeffery = Pepsi, espresso, and water

Drink variable arranged by the order of increasing Caffeine content are presented as follows;

Caffeine content of water < Caffeine content of Pepsi < Caffeine content of espresso

The triplet with the double shot of espresso = The triplet with the highest heart rate

4. The independent variable is the variable which is suspected to be the cause of the specified observation

Therefore, in the question, the independent variable are the drinks with different amount of caffeine

5. The dependent variable is the effect or the outcome of the independent variable

The dependent variable in the question is the heart rate of the subjects in the study

6. The control group is the independent variable or input that is expected to give the minimum effect or output compared to other independent variables in the study such that the control group does not contain the suspected cause of the observation or effect under investigation

The control group (or variable) in the question is water which does not contain caffeine

7. Three constants that all three brothers should be doing are;

i) The three brothers should be taking a constant or the same quantity of their preferred drink

ii) The frequency at which they take their drinks should be constant

iii) The time at which the brothers take the drink should be the same

Answer:  CaCO3 = CaO  + CO2

Explanation:

 CaCO3 = CaO  + CO2

This is balanced already.

Elem      Reactant  Products

Ca                1                  1

C                  1                   1

O                  3                  3

1.5 atm pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm.

The relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures, when the gas's molecules move virtually independently of one another, is known as the ideal gas law, also known as the perfect gas law.

T\(_N_e\)​ =30⁰C=(30+273)K=303K

T\(_N_2\)​​ =20⁰C=(20+273)K=293K

P\(_N_2\) ​ =1.0atm

Ideal gas constant - R=0.0821L⋅atm/ K⋅ mol

The molar mass of

Neon - M\(_N_e\)​​=20.18g/mol

Nitrogen - M\(_N_2\)​​ ​ =2⋅14.007g/mol=28.014g/mol

Determine the pressure P\(_N_e\)​  required for neon at 30⁰C to have the same density (d) as nitrogen at 20⁰C.

d = m/V

We know that

n = m/M

Using the ideal gas law, we get

PV = nRT

PV = m/M *RT

Since

PM/RT = m/V =d

d =  PM/RT

d= \(\frac{P_{N_2} M_{N_2}}{R T_{N_2}}\)

d = 1.0 atm * 28.014 g/mol/0.0821L atm/K mol 293K

d = 1.2 g//L

Since both gases have the same density, we can calculate the pressure of neon gas, using

\(d=\frac{P_{N e} M_{N e}}{R T_{N e}}\)

\(P_{N e}=\frac{d R T_{N e}}{M_{N e}}\)

\(P_{N e}\)=1.2g/L . 0.0821L . atm/K.mol.303 K/20.18 g/mol

\(P_{N e}\)=1.5 atm

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Answer:

a 3atm

Explanation:

or d 40 psi because it is true and corect [b 3.0398 21oinwex id cn uerfh uh 837hf uxhoec

The mass of 50,000 molecules of methane is 1.35 × 10⁻¹⁸ gram.

To find the mass of 50,000 molecules of methane, we need to multiply the mass of one methane molecule by the number of molecules.

Given:

Mass of one methane molecule = 2.7 × 10⁻²³ gram

Number of methane molecules = 50,000

To calculate the mass of 50,000 molecules of methane, we can use the following equation:

Mass = (Mass of one molecule) × (Number of molecules)

Mass = (2.7 × 10⁻²³ gram) × (50,000)

Now, let's calculate the mass:

Mass = 2.7 × 10⁻²³ × 50,000

Mass = 1.35 × 10⁻¹⁸ gram

Therefore, the mass of 50,000 molecules of methane is 1.35 × 10⁻¹⁸ gram.

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Answer:

 a supply of electric charges which are free to flow, some form of push to move the charges through the circuit and a pathway to carry the charges.

Explanation:

There's your answer have a good day

80  grams of tin would be found in this sample.

wt% = (mass compound/mass alloy)×100

for antimony:

⇒ 16% = (g antimony / g alloy)×100

⇒ 0.16 = g antimony / g alloy

∴ g alloy = 500 g

⇒ (0.16)×(500 g) = g antimony

⇒ g antimony = 80 g

A substance that combines more than one metal or mixes a metal with other non-metallic elements is known as a metal alloy. Brass, for instance, is an alloy of the two metals copper and zinc. A metallic element (iron) and a trace amount (up to 2%) of a non-metallic element are alloyed to form steel (carbon).

An alloy's main advantages are its capacity to reduce costs while simultaneously strengthening metals while preserving their best qualities. Consider the metal iron, which has outstanding strength and durability.

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Answer:

Liquid

Explanation:

If you put 1 liter of water in a vessel of any shape, water changes its shape according to the shape of the vessel but still remains 1 liter. So, any liquid has fixed volume but doesn't have fixed shape.

Answer:

\(\boxed {\boxed {\sf 0.5 \ mol \ CaCl}}}\)

Explanation:

Molarity is a measure of concentration in moles per liter.

\(molarity= \frac{moles \ of \ solute}{liters \ of \ solution}\)

We know the molarity is 2.0 M CaCl. However, we can convert the units to make the problem easier. 1 molar (M) is equal to 1 mole per liter. A 2.0 M CaCl molarity is equal to 2.0 moles of CaCl per liter.

We also know there are 250 milliliters of solution. however, we need to find the liters. Remember that 1 liter contains 1000 milliliters.

Now we can substitute the values we know into the formula. Since moles of solute are unknown, we can use x.

\(2.0 \ mol \ CaCl/ L= \frac{x}{0.250 \ L}\)

Since we are solving for x (the moles of solute), we need to isolate the variable. It is being divided by 0.250 L. The inverse of division is multiplication, so we multiply both sides by 0.250 L.

\(0.250 \ L *2.0 \ mol \ CaCl/ L= \frac{x}{0.250 \ L} * 0.250 \ L\)

\(0.250 \ L *2.0 \ mol \ CaCl/ L=x\)

The units of liters (L) cancel.

\(0.250 * 2.0 \ mol \ CaCl=x\)

\(0.5 \ mol \ CaCl=x\)

There are 0.5 moles of solute in 250 milliliters of a 2.0 M solution.

Answer:

0.005 moles

Explanation:

120cm^3 = 0.12dm^3

1mol is always 24dm^3 of gas at rtp

0.12 ÷ 24 = 0.005 moles

Answer:

a

Explanation:

Warm air and water both tend to rise while cooler air and water sink different parts of the oceans are heated unevenly, this causes the water to move in convection currents.

A stream of charged particles, such as electrons or ions, traveling through an electrical conductor or a vacuum is known as an electric current. The net rate of electric charge flowing through a surface or into a control container is how it is calculated.

Magnetic fields are produced by electric currents and are applied in motors, generators, inductors, and transformers. They result in Joule heating in conventional conductors, which lights up incandescent light bulbs.

Electromagnetic waves produced by time-varying currents are utilized in communications to transmit information.

Thus, option A is correct.

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The final product of the reaction of propylmagnesium bromide with benzaldehyde is phenol component with side product. The above figure show the reaction.

A Grignard reaction is a reaction in which alkyl/aryl magnesium halide reacts with a carbonyl group, C=O. This reaction has been named on the name of Victor Grignard. We have to draw the structure of the product of the reaction of propylmagnesium bromide with benzaldehyde. The chemical formula for Propylmagnesium bromide is CH₃CH₂CH₂MgBr and Benzaldehyde is C₆H₅CHO. When benzaldehyde reacts with grignard reagent in dilute aqueous acid ( H positive). It will produce adduct alcohol that is not a product. In between final product, reagent attached to benzene ring with Oxygen site but it is not stable, so, the bonds break up and MgBr removed by leaving Hydrogen in its place. So, the final product is Phenol with side product CH₃CH₂CH₂CH₃.

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A neutral atom of vanadium in its ground state has 23 electrons, and its electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d3.

The outermost valence electron of vanadium is located in the 4s orbital, which has a maximum capacity of 2 electrons. This means that vanadium has only one valence electron in the 4s orbital, and it is available for bonding with other atoms. Vanadium is a transition metal that exhibits variable oxidation states, which means that it can lose or gain electrons from its valence shell. Understanding the location of valence electrons is important in predicting the chemical properties of elements and their reactivity with other substances.

A neutral atom in the ground state of vanadium has its outermost valence electron in the 3d orbital. Vanadium has an atomic number of 23, which means it has 23 electrons. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³. The outermost valence electrons are found in the highest energy level, which is the fourth shell, with the 4s² and 3d³ electrons. Since the 3d orbital has higher energy than the 4s orbital, the last electron added to the atom will be in the 3d orbital.

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Answer:In reality, if we are talking about an object under the influence of the Earth's gravity, the gravitational potential energy of the object will change minutely, even if kept at the same elevation above sea level, because of differences, if it is moved to different positions, due to changes in sub-surface rock masses

Explanation:

Branliest pls :)

The mass, in grams, of H₂O is produced in the decomposition of ammonium nitrate is 72.06 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

Moles of 160.1 g of NH₄NO₃ = 160.1g / 80.03g/mol = 2moles

From the stoichiometry of the reaction, it is clear that:

1 moles of NH₄NO₃ = produce 2 moles of H₂O

2 moles of NH₄NO₃ = produce 2×2=4 moles of H₂O

Mass of H₂O will be calculated as:

W = (4mol)(18.01 g/mol) = 72.04 grams (72.06 approx)

Hence, option (4) is correct.

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The molecular geometry (form) of CCl4 SF6 is identical to the configuration of the electron domains in a VSEPR.

VSEPR distinguishes between molecular geometry, which defines how the atoms in a molecule are ordered, and electron group geometry, which expresses how electron groups (bonds and nonbonding electron pairs) are arranged.

Chemistry frequently employs the valence-shell electron-pair repulsion (VSEPR) model to foretell the three-dimensional organization, or geometry, of molecules. This model accounts for the repulsion between electron pair to estimate the structure of a molecule.

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This problem is providing us with a reaction between sodium hydroxide and copper (II) chloride, so the spectator ions are required. At the end, these turn out to be Na⁺ and Cl⁻.

In chemistry, a significantly great number of chemical reactions involve the exchange of ions for them to occur. Thus, one can have three versions of a chemical reaction; the complete equation, complete ionic equation and net ionic equation.

In such a way, to exemplify this, the complete equation for the given reaction is just:

\(2NaOH(aq) + CuCl_2(aq) \rightarrow 2NaCl(aq) + Cu(OH)_2 (s)\)

Which of course, must be balanced. Next, for the complete ionic equation, one must separate the aqueous species into ions:

\(2Na^+(aq)+2OH(aq) + Cu^{2+}(aq)+2Cl^-(aq) \rightarrow 2Na^+(aq)+Cl^-(aq) + Cu(OH)_2 (s)\)

Where the copper (II) hydroxide is clearly nonionizing as it remains as a precipitate (solid).

Finally, the net ionic equation omits the spectator ions, which are basically ions that appear on both reactants and products side, in this case both Na⁺ and Cl⁻:

\(2OH^-(aq) + Cu^{2+}(aq)\rightarrow Cu(OH)_2 (s)\)

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Taking into account the reaction stoichiometry, 355 grams of Na₂SO₄ will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid.

In first place, the balanced reaction is:

H₂SO₄ + 2 NaOH  → Na₂SO₄ + 2 H₂O

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

It can be applied the following rule of three: if by reaction stoichiometry 80 grams of NaOH form 142 grams of Na₂SO₄, 200 grams of NaOH form how much mass of Na₂SO₄?

mass of Na₂SO₄= (142 grams of Na₂SO₄×200 grams of NaOH) ÷80 grams of NaOH

mass of Na₂SO₄= 355 grams

Finally, 355 grams of Na₂SO₄ are formed.

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With respect to bonding and electrical conductivity, respectively, sulfur hexafluoride, sf6(g), would be described as "covalent and a nonconductor" because sulfur hexafluoride would be a covalent compound since neither fluorine nor sulfur are metallic elements and aqueous solutions containing covalent bonding do not conduct electricity.

The ability of an electrical charges or heat to move through a material is measured by its conductivity. A material is considered a conductor if it offers relatively minimal resistance to the transfer of thermal or electric energy.

The electricity is conducted by-

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One of the most important enzymes in the world—nitrogenase, the plant protein that catalyzes nitrogen fixation— contains active clusters of iron, sulfur, and molybdenum atoms

To calculate the edge length for given density of metal, we use the equation:

p =Zx M/ Na x a^³                                       (eq)1

where,                        density = 10.28g/cm3

Z = number of atom in unit cell = 2  (BCC)

M = atomic mass of metal (molybdenum) = 95.94 g/mol

Avogadro's number

a = edge length of unit cell which we need to find

a = edge length of unit cell =?

Putting values in above equation, we get:

10.28=2x 95.94 /  6.022 x 10^23 x 10.28

= 3.099x 10^ -23

a = ∛3.099  x 10^23

=3.14 x 10^-8

=314pm

Conversion factor used:    1cm=10^10pm

Hence, the edge length of the unit cell is 314 pm

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Answer:

Clear Communication

Explanation:

Clear communication in key when working with a team on a project. Without communication things get messy. Having clear communication with your team mates helps to prevent miscommunication, issues in planning and completing the project, and more. Clear communication can also help you to hear everybody out to come out with the best version of your project and to prevent fighting that would take up time that you could be working.

Answer:

NO! It would be in violation of the workplace regulation regarding oxygen.

Explanation:

Bulk oxygen systems convey liquified oxygen which is of geat use and importance in institutions like a nuirsing home.

Liquified oxygen is gaseos oxygen that has been condensed under high presures into liquid form. It is transported via a complex system of vaporizers, storage tanks and pipes around the facility it is needed. Liquified oxygen is oxygen- rich.

Asphalt is a petroleum derivative that is often used to in coating surfaces and tarring roads.

Its primry constituent is Carbon with minor constitunets like sulphur, nirogen, oxygen. As a petrolem derivative, it is very combustible.

In the event of an oxygen leak on an asphalt surtface, oxygen acting as an oxidizing agent can combine with asphalt in the presence of air, to cause a large fire.

Hence, asphalt surfacing in areas of oxygen leaks, would not be in compliance with the workplace regulation as it has the potential of causing a fire in the nursing home.