Calculate the concentration of the silver ion in a solution that initially is 0.010 M with respect to Ag(NH3)2+. Give the answer in 2 sig figs. The concentration of the free Ag+ ions will be Х 5.1 X10 -4

The volume of the Naoh that is required was =4.074

What is the use of the buffer solution ?

A buffer is an aqueous solution made up of a weak acid and its salt (acid buffer) or a weak base and its salt (base buffer) (basic buffer). When a small amount of strong acid or base is added to it, its pH changes very little, and it is thus used to prevent the pH of a solution from changing.

Buffer solutions are utilised in several chemical applications. Blood is one example of a natural buffer solution. The natural pH of human blood is 7.4. Many people suffer from severe anxiety and alkalosis. Alkalosis is a condition in which the blood pH is abnormally high. The opposite situation is known as acidosis, which occurs when the pH of the blood exceeds 7.4.

naoh+nah2po4 ------------> h2o+na3po4

pka=3.39

7.30=3.39+(log(h2o/naoh)

log(h2o/naoh)=7.30-3.39

=3.91

=10^log(h2o/naoh)=10^3.91

=4.074

The volume required was=4.074

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Answer:

The "control" is a group that continues under normal conditions in an experiment.

Explanation:

The control group regulates the experiment and serves as a reference point for changing variables.

Separation of mixtures is the process of isolating and purifying individual components from a mixture. It has a wide range of applications in various fields, including chemistry, biology, and environmental science. Here are ten beneficial effects of separation of mixtures:

Helps to obtain pure substances: Separation of mixtures helps in obtaining pure substances, which are essential for research and industrial processes.

Enables identification of individual components: Separation of mixtures allows the identification and characterization of individual components in a mixture.

Allows the removal of impurities: Separation of mixtures can be used to remove impurities from a mixture, which can improve the quality of the final product.

Facilitates recycling: Separation of mixtures is crucial for recycling materials such as plastic, paper, and metals.

Enables selective extraction: Separation of mixtures can be used to selectively extract specific components from a mixture.

Helps in drug development: Separation of mixtures is important in drug development, where pure compounds are required for testing and clinical trials.

Helps in forensic analysis: Separation of mixtures is used in forensic analysis to identify and analyze evidence.

Facilitates food processing: Separation of mixtures is used in the food industry to extract and purify ingredients.

Enables the production of clean energy: Separation of mixtures is used in the production of clean energy, such as separating hydrogen from other gases.

Helps in environmental remediation: Separation of mixtures is used in environmental remediation to separate and remove pollutants from soil, water, and air.

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Answer:

molecule

Explanation:

A molecule is formed from two or more atoms

Answer:

M = 3.0 M.

Explanation:

Hello there!

In this case, according to the definition of molarity, it turns out possible for us to calculate the required molar concentration of the given volume of solution and moles of solvent by knowing they are divided as follows:

\(M=\frac{n}{V}\)

However, since the volume is in liters, we first convert the 2500 mL to L and then calculate the resulting molarity as shown below:

\(V=2500mL*\frac{1L}{1000mL} =2.500L\\\\M=\frac{7.5mol}{2.500L}\\\\M=3.0M\)

Whereas M stands for molar units of mol/L.

Regards!

Answer:

It is the first one.

Explanation:

Because yeah.

Therefore, the Henry's constant for helium at the given temperature and pressure is 100 μg/g-atm.

Henry's law states that the amount of gas dissolved in a liquid is proportional to the partial pressure of the gas above the liquid. The proportionality constant is known as Henry's constant (kH) and depends on the gas, the liquid, and the temperature and pressure conditions.

In this case, we can use Henry's law to relate the partial pressure of helium in air (which is 0.003 times the atmospheric pressure) to the concentration of helium in water (which is 0.3 parts per million by mass, or ppm, which is equivalent to 0.3 μg/g). We can assume that the solubility of helium in water is low and that the concentration of helium in air does not change significantly upon dissolution in water.

The equation for Henry's law can be written as:

C = kH * P

where C is the concentration of the dissolved gas in the liquid, kH is Henry's constant, and P is the partial pressure of the gas above the liquid.

In this case, we know that C = 0.3 ppm (or 0.3 μg/g) and P = 0.003 * Patm (where Patm is the atmospheric pressure). We want to solve for kH.

kH = C/P

= (0.3 μg/g) / (0.003 * Patm)

The units of kH will be (μg/g)/(atm), which can also be expressed as (mol/L)/(atm) using the molar mass of helium and the density of water. At standard temperature and pressure (STP, 0°C and 1 atm), the molar volume of a gas is 22.4 L/mol. Therefore, the concentration of helium in air at STP is 0.3/22.4 = 0.0134 mol/L, and the partial pressure of helium is 0.003 * 1 atm = 0.003 atm.

Substituting these values into the equation, we get:

kH = (0.3 μg/g) / (0.003 atm * Patm/1 atm)

= 100 μg/g-atm

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Answer:

A) one year

Explanation:

One complete revolution takes 365.25 days, or one year.

Answer:

1 year

Explanation:

16 electrons are transferred from the citrate cycle intermediates to nad and fad.

The citric acid cycle (CAC)—additionally called the Krebs cycle or the TCA cycle (tricarboxylic acid cycle)—is a chain of chemical reactions to release stored electricity thru the oxidation of acetyl-CoA derived from carbohydrates, fat, and proteins.

The citric acid cycle: in the citric acid cycle, the acetyl organization from acetyl CoA is attached to a 4-carbon oxaloacetate molecule to form a six-carbon citrate molecule. through a chain of steps, citrate is oxidized, liberating carbon dioxide molecules for every acetyl institution fed into the cycle.

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The oxygen atom in the water molecule has two lone pairs, one of which could be used to form a bond with a proton and, therefore, the water molecule could act as a base in a reaction. Since water has the potential to act both as an acid and as a base, water is amphoteric.

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The air is too "rich" to burn above the upper limit, but the situation might soon deteriorate into danger: For instance, increasing the air in a space can quickly reduce the product's vapor percentage to levels that are within its flammability range, which could have explosive effects.

Flammable liquids and gases need to be handled and stored carefully since they have low flash points. Never assume that these items won't catch fire. You must continually keep in mind the safety precautions for handling and storing combustible products if you want to keep both you and your company safe.

To prevent them from getting engaged and stoking a fire, combustible objects including cardboard, paper towels, sawdust, and waste must be kept away from flammable storage spaces. All flammable liquid containers must be kept closed while not in use to further help avoid fires.

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Answer:

it is becuse the students used wrong apparatus

The biggest error in this investigation is the use of inappropriate types of equipment.

The types of equipment used in the given setup are inappropriate. Suggested improvements in the apparatus to increase the accuracy are given below:

1. The use of a polystyrene cup in the laboratory for any reaction is inappropriate. As a slight increase in temperature causes the decomposition of the chemicals in the cup as well.

2. The use of a thermometer stand is a must. Without using the stand, the tip of the thermometer touches the lid of the container, which causes inaccuracies in the result.

Hence, all the suggestions are listed above.

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1- U(r) has a repulsive region at small r due to electron-electron repulsion, followed by an attractive region at intermediate r due to electron-nucleus attraction, and a negligible potential at large r.

The potential energy, U(r), for a system of two atoms can be represented graphically as a function of the internuclear separation distance, r. At small values of r, the atoms experience repulsion due to the electron-electron interactions, resulting in a steep increase in potential energy. This repulsive region prevents the atoms from getting too close to each other.

As the internuclear separation distance increases, the attractive force between the electrons and the nuclei becomes dominant, leading to a decrease in potential energy. This attractive region is typically characterized by a shallow potential well. At intermediate values of r, the potential energy reaches a minimum, indicating a stable configuration where the atoms are bonded.

2- Bohr's model describes the hydrogen atom as a nucleus with an electron orbiting it in quantized energy levels. Electrons can transition between levels by absorbing/emitting photons with energy given by ΔE = hf. The model has limitations but introduced the concept of discrete energy states in atoms.

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Answer: lithium- 3 protons, 3 electrons, 3 neutrons

Oxygen- nucleon no. 16, Atomic no. 8, 8 protons, overall charge (-2)

Sorry I don't the others. Hope this helps

Answer:

acetone evaporates faster than hexane.

Explanation:

because acetone does nor participate in hydrogen bonding, so it's intermolecular forces are comparatively weaker, and it evaporates most quickly.

Answer:

Iron (III) oxide reacts with carbon monoxide according to the balanced equation: Fe2O3 + 3CO

All matter has bodily and chemical homes. Physical homes are traits that scientists can degree with out converting the composition of the pattern below study, including mass, color, and volume.

Chemical homes describe the function  potential of a substance to react to shape new substances; they encompass its flammability and susceptibility to corrosion.

All samples of a natural substance have the identical chemical and bodily homes. For example, natural copper is constantly a reddish-brown stable (a bodily property) and constantly dissolves in dilute nitric acid to supply a blue answer and a brown gas (a chemical property).

Physical homes may be widespread or in depth. Extensive homes range with the quantity of the substance and encompass mass, weight, and volume. Intensive homes, in contrast, do now no longer rely on the quantity of the substance.

they encompass color, melting point, boiling point, electric conductivity, and bodily nation at a given temperature. No matter what quantity is examined Scientists typically degree in depth homes to decide a substance’s identity, while widespread homes deliver records approximately the quantity of the substance in a pattern.

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Answer:

Chloroplasts?

Explanation:

7. the pH of 0.81 M Mg(OH)₂ solution is 9.19.

8. the pH of 0.27 M pyridine solution is 9.11.

Mg(OH)₂ is a base which dissociates to produce two OH⁻ ions.

Mg(OH)₂ → Mg²⁺ + 2 OH⁻

Let the concentration of OH⁻ ions produced be x.

Therefore, the concentration of Mg²⁺ is 0.81-x

Mg(OH)₂ → Mg²⁺ + 2 OH⁻

Initial concentration (M)    0         0

Change (M)                 -x         +2x

Equilibrium Concentration  0.81-x      x     x

Using Kb for Mg(OH)₂,Kb = Kw/Ka

Kw = 1.0 × 10⁻¹⁴ at 25 °C.

For Mg(OH)₂,Kb = [Mg²⁺][OH⁻]²/Kw= (x)²/0.81 - x

Kb = 4.5 × 10⁻¹² = x²/0.81 - x

On solving the equation,x = 7.7 × 10⁻⁶M

Therefore, the concentration of OH⁻ ions = 2 × 7.7 × 10⁻⁶ = 1.54 × 10⁻⁵ M

To calculate the pH of the solution, use the formula:

pOH = - log [OH⁻]= - log 1.54 × 10⁻⁵pOH = 4.81pH = 14 - 4.81 = 9.19

Thus, the pH of 0.81 M Mg(OH)₂ solution is 9.19.

Let the concentration of OH⁻ ions produced be x.

Therefore, the concentration of C₅H₅NH⁺ is 0.27 - x.

C₅H₅N + H₂O ⇌ C₅H₅NH⁺ + OH⁻

Initial concentration (M)   0.27      0

Change (M)                -x       +x

Equilibrium Concentration  0.27-x     x

Using Kb for C₅H₅N,Kb = Kw/Ka

Kw = 1.0 × 10⁻¹⁴ at 25 °C.

For C₅H₅N,

Kb = [C₅H₅NH⁺][OH⁻]/[C₅H₅N]= (x) (x)/(0.27-x)Kb = 1.7 × 10⁻⁹

= x²/(0.27-x)

On solving the equation,

x = 1.3 × 10⁻⁵ M

Therefore, the concentration of OH⁻ ions = 1.3 × 10⁻⁵ M

To calculate the pH of the solution, use the formula:

pOH = - log [OH⁻]= - log 1.3 × 10⁻⁵pOH

= 4.89pH = 14 - 4.89 = 9.11

Thus, the pH of 0.27 M pyridine solution is 9.11.

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Using prefixes before the name of each element, the number of atoms of each element present in the molecular is indicated.

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Answer:

Explanation:

solid would be a wall e.g

liquid would be water e.g

gas would be oxygen e.g

If your NMR sample is contaminated with ethanol, the peaks would appear at 1.2 ppm and 3.6 ppm in your 1H NMR spectrum.

If your NMR sample is contaminated with ethanol, you will observe peaks corresponding to ethanol's protons in your 1H NMR spectrum. The peak at 1.2 ppm corresponds to the methyl group in ethanol and the peak at 3.6 ppm corresponds to the methylene group. It is important to ensure that your NMR sample is free from any contaminants to obtain accurate results. Ethanol has the chemical structure CH3CH2OH, and its peaks will appear at the following ppm values:

1. The CH3 group: This methyl group is a singlet and will appear around 1.0-1.2 ppm.
2. The CH2 group: This methylene group is a quartet and will appear around 3.6-3.7 ppm.
3. The OH group: This hydroxyl proton is a singlet and will appear in the broad range of 2.5-5.0 ppm due to hydrogen bonding and exchange effects.

Keep in mind that the exact ppm values might vary slightly depending on the solvent and experimental conditions.

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Answer:

Tha nolar mass of aluminium is 26.98 g/mol; the molar mass of (atomic) oxygen is 16.90 g/mol.

Explanation:

1 mol of Al2O3 therefore has a mass of 2(26.98)+3(16.00)=101.96 g.

Divide this into the given mass, to find the number of moles here:

(204 g)/(101.96 g/mol)=2.001 mol

There are 2 moles of aluminium per mole of aluminium oxide, so there are 2(2.001)=4.002 moles of aluminium in the sample.

Then there are (4.002 mol)(26.98 g/mol)=107.97 g of Al. Since the given mass has only 3 significant figures, round this answer o 108 g.

Answer:

there are 4 sig figs in 120.9 and there are 4 sig figs in 1.008

Explanation:

An element with properties halfway between those of metals and nonmetals is said to be a metalloid. Semimetals are another name for metaloids.

A metalloid is an element that is difficult to categorize as either a metal or a nonmetal because it has a majority of qualities that fall between those of metals and nonmetals or that are a combination of both.

Except for hydrogen, which is a nonmetal, the elements are arranged in a triangle with the metals to the left, the nonmetals to the right, and the metalloids to the immediate right of the triangle.

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Answer:

Explanation:

The equation for the reaction of lithium with water to produce lithium hydroxide and hydrogen gas is:

Li + H2O -> LiOH + H2

To balance this equation using the electron-transfer method, we first need to determine the oxidation states of each element in the reactants and products.

In Li, the oxidation state of lithium is +1. In H2O, the oxidation state of hydrogen is +1 and oxygen is -2.

In LiOH, the oxidation state of lithium is +1, oxygen is -2 and hydrogen is +1.

In H2, the oxidation state of hydrogen is +1.

It's clear that lithium loses 1 electron to become Li+ and hydrogen gains 1 electron to become H-.

So, we have to add an electron on the right side of the equation to balance the electrons.

Li + H2O -> LiOH + H2 + e-

Now, the number of electrons on both sides of the equation is the same and the equation is balanced.

Alternatively, we can use the oxidation number method, where we balance the charge of the reactant and product side of the equation. The sum of the oxidation numbers of all atoms on the reactant side must equal the sum of the oxidation numbers of all atoms on the products side. In this case, the oxidation state of lithium is +1, hydrogen is +1 and oxygen is -2.

Li + H2O -> LiOH + H2

+1 +1 -2 = +1 +1 +1 -2

The equation is already balanced with respect to oxidation numbers

Answer:

No, I believe it's not balanced, srry if I got it wrong for you

Answer:

What grade r u in

Explanation:

Just bcauz Ima coo dud and 5=5 and 1=1

Both precision and accuracy are vital in scientific experiments, but they stand different aspects of the experimental results.

Precision means how consistent or reproducible the measurements are when you do an experiment many times. If you do the experiment many times and always get similar numbers for the metal's specific heat, then the experiment is considered to be very accurate. Accurate measurements have little variation and give trustworthy information about the possible range where the correct value is expected to be.

Therefore, Accuracy means how well the measured values match the true or expected value. An accurate measurement means that it is very close to the correct or expected value.

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