Question 1

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13. A 0.10 M aqueous solution of Na₃PO₄ therefore would be ________.

Accepted Answer

The answer of For H₃PO₄, K_a1 = 7.3 × 10^-3,...

Question 2

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO₃, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

Lithium nitrate (LiNO3) is a salt derived from a strong base (LiOH) and a strong acid (HNO3). When it dissolves in water, it does not affect the pH of the solution, resulting in a neutral solution.

Question 3

A student adds 0.1 mol of oxalic acid and 0.1 mol of sodium dihydrogen phosphate to enough water to make 1.0 L of solution. The following equilibrium is established with the concentrations of the products greater than the concentrations of the reactants. Which of the statements about the equilibrium system is correct? H₂C₂O₄(aq) + H₂PO₄^-(aq) HC₂O₄^-(aq) + H₃PO₄(aq)

Accepted Answer

The answer of A student adds 0.1 mol of oxalic...

Question 4

Ammonium chloride is used as an electrolyte in dry cells. Which statement about a 0.10 M solution of NH₄Cl is correct?

Accepted Answer

Ammonium chloride dissociates into ammonium ions (NH4+) and chloride ions (Cl-) in water. The ammonium ion can act as a weak acid, donating a proton to water to produce hydronium ions (H3O+). This results in an acidic solution with a pH lower than 7.

Question 5

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO₃)₃, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

Iron(III) nitrate, Fe(NO3)3, dissociates in water to form Fe3+ ions and NO3- ions. The Fe3+ ions can hydrolyze in water to form Fe(OH)2+ and H+. The concentration of H+ ions will be greater than the concentration of OH- ions, making the solution acidic. Therefore, the correct answer is C, the solution is acidic. Iron(III) nitrate dissociates in water to form Fe3+ and NO3- ions. The Fe3+ ion can act as an acid in water, forming H+ ions and resulting in an acidic solution. Therefore, the solution is acidic.

Question 6

Which is the strongest base?

Accepted Answer

The strength of a base is determined by its Kb value; the higher the Kb, the stronger the base. Option E has the highest Kb value (5.6 × 10^-4), indicating it is the strongest base among the options listed.

Question 7

What is the pH of a 0.0100 M sodium benzoate solution? K_b (C₇H₅O₂^-) = 1.5 × 10^-10

Accepted Answer

Sodium benzoate is a salt of a weak acid (benzoic acid) and a strong base (NaOH). It hydrolyzes in water to form a basic solution. Using the Kb value, we can calculate the pOH and then the pH. The pH is approximately 8.09.

Question 8

What is the value of K_b for the cyanide anion, CN^-? K_a(HCN) = 6.2 × 10^-10

Accepted Answer

The answer of What is the value of K_b for...

Question 9

The reaction of a strong acid with water results in

Accepted Answer

When a strong acid reacts with water, it donates a proton to water molecules, forming hydronium ions and leaving behind the conjugate base of the acid. The resulting conjugate base is weak, as it is able to accept a proton and reform the original acid. Therefore, choice C is the best answer.

Question 10

What is the value of K_b for the formate anion, HCOO^- ? K_a (HCOOH) = 2.1 × 10^-4

Accepted Answer

The answer of What is the value of K_b for...

Question 11

Which one of these salts will form an acidic solution upon dissolving in water?

Accepted Answer

The answer of Which one of these salts will form...

Question 12

Which one of these salts will form a basic solution upon dissolving in water?

Accepted Answer

The presence of the oxide ion (O2-) in NaNO₂ makes it basic when dissolved in water, as the oxide ion can accept a proton (H+) to form the hydroxide ion (OH-). The other salts listed do not contain an ion capable of accepting a proton and therefore will not form a basic solution when dissolved in water.

Question 13

Which aqueous solution has the highest pH?

Accepted Answer

ZnCl₂ has the highest pKa value (9.0), indicating it is the weakest acid among the options, thus its aqueous solution would have the highest pH.

Question 14

Which is the strongest acid?

Accepted Answer

HClO₃ is the strongest acid among the given options due to the high electronegativity of chlorine, which stabilizes the conjugate base more effectively than the other halogens.

Question 15

A solution is prepared by adding 0.10 mol of potassium chloride, KCl, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

Potassium chloride (KCl) is a salt that dissociates completely in water into K+ and Cl- ions. Neither ion reacts significantly with water to change its pH, so the solution remains neutral.

Question 16

A solution is prepared by adding 0.10 mol of sodium fluoride, NaF, to 1.00 L of water. Which statement about the solution is correct?

Accepted Answer

The solution is basic because fluoride ions (F-) from NaF can react with water to form hydroxide ions (OH-), increasing the pH.

Question 17

Calculate the pH of a 0.021 M NaCN solution. [K_a(HCN) = 4.9 × 10^-10]

Accepted Answer

NaCN is a salt of a weak acid (HCN) and a strong base (NaOH). The CN⁻ ion will hydrolyze in water to form OH⁻, making the solution basic. The Kb for CN⁻ can be calculated using Kw/Ka = Kb. Then, using the Kb value, the concentration of OH⁻ can be found, and subsequently, the pOH and pH can be calculated. The pH of the solution is approximately 10.81.

Question 18

Calculate the concentration of malonate ion (C₃H₂O₄^2-) in a 0.200 M solution of malonic acid (C₃H₄O₄). (For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.)

Accepted Answer

The answer of Calculate the concentration of malonate ion (C₃H₂O₄^2-)...

Question 19

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13. A 0.10 M aqueous solution of NaH₂PO₄ therefore would be ________.

Accepted Answer

NaH₂PO₄ is the salt of a weak acid (H₃PO₄) and a weak base (NaOH). The solution is weakly acidic because the second dissociation constant (Ka2) is greater than the hydrolysis constant of the conjugate base.

Question 20

What are the products of hydrolysis of NH₄Cl?

Accepted Answer

Hydrolysis of NH₄Cl produces NH₃, H₃O⁺, and Cl^- ions.

Quiz 16: Acids and Bases

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13. A 0.10 M aqueous solution of Na₃PO₄ therefore would be ________.

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO₃, to 1.00 L of water. Which statement about the solution is correct?

Ammonium chloride is used as an electrolyte in dry cells. Which statement about a 0.10 M solution of NH₄Cl is correct?

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO₃) ₃, to 1.00 L of water. Which statement about the solution is correct?

Which is the strongest base?

What is the pH of a 0.0100 M sodium benzoate solution? K_b (C₇H₅O₂^-) = 1.5 × 10^-10

What is the value of K_b for the cyanide anion, CN^-? K_a(HCN) = 6.2 × 10^-10

The reaction of a strong acid with water results in

What is the value of K_b for the formate anion, HCOO^- ? K_a (HCOOH) = 2.1 × 10^-4

Which one of these salts will form an acidic solution upon dissolving in water?

Which one of these salts will form a basic solution upon dissolving in water?

Which aqueous solution has the highest pH?

Which is the strongest acid?

A solution is prepared by adding 0.10 mol of potassium chloride, KCl, to 1.00 L of water. Which statement about the solution is correct?

A solution is prepared by adding 0.10 mol of sodium fluoride, NaF, to 1.00 L of water. Which statement about the solution is correct?

Calculate the pH of a 0.021 M NaCN solution. [K_a(HCN) = 4.9 × 10^-10]

Calculate the concentration of malonate ion (C₃H₂O₄^2-) in a 0.200 M solution of malonic acid (C₃H₄O₄) . (For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.)

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13. A 0.10 M aqueous solution of NaH₂PO₄ therefore would be ________.

What are the products of hydrolysis of NH₄Cl?

Quiz 16: Acids and Bases

For H3PO4, Ka1 = 7.3 × 10-3, Ka2 = 6.2 × 10-6, and Ka3 = 4.8 × 10-13. A 0.10 M aqueous solution of Na3PO4 therefore would be ________.

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO3, to 1.00 L of water. Which statement about the solution is correct?

Ammonium chloride is used as an electrolyte in dry cells. Which statement about a 0.10 M solution of NH4Cl is correct?

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO3) 3, to 1.00 L of water. Which statement about the solution is correct?

Which is the strongest base?

What is the pH of a 0.0100 M sodium benzoate solution? Kb (C7H5O2-) = 1.5 × 10-10

What is the value of Kb for the cyanide anion, CN-? Ka(HCN) = 6.2 × 10-10

The reaction of a strong acid with water results in

What is the value of Kb for the formate anion, HCOO- ? Ka (HCOOH) = 2.1 × 10-4

Which one of these salts will form an acidic solution upon dissolving in water?

Which one of these salts will form a basic solution upon dissolving in water?

Which aqueous solution has the highest pH?

Which is the strongest acid?

A solution is prepared by adding 0.10 mol of potassium chloride, KCl, to 1.00 L of water. Which statement about the solution is correct?

A solution is prepared by adding 0.10 mol of sodium fluoride, NaF, to 1.00 L of water. Which statement about the solution is correct?

Calculate the pH of a 0.021 M NaCN solution. [Ka(HCN) = 4.9 × 10-10]

Calculate the concentration of malonate ion (C3H2O42-) in a 0.200 M solution of malonic acid (C3H4O4) . (For malonic acid, Ka1 = 1.4 × 10-3, Ka2 = 2.0 × 10-6.)

For H3PO4, Ka1 = 7.3 × 10-3, Ka2 = 6.2 × 10-6, and Ka3 = 4.8 × 10-13. A 0.10 M aqueous solution of NaH2PO4 therefore would be ________.

What are the products of hydrolysis of NH4Cl?

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13. A 0.10 M aqueous solution of Na₃PO₄ therefore would be ________.

A solution is prepared by adding 0.10 mol of lithium nitrate, LiNO₃, to 1.00 L of water. Which statement about the solution is correct?

Ammonium chloride is used as an electrolyte in dry cells. Which statement about a 0.10 M solution of NH₄Cl is correct?

A solution is prepared by adding 0.10 mol of iron(III) nitrate, Fe(NO₃) ₃, to 1.00 L of water. Which statement about the solution is correct?

What is the pH of a 0.0100 M sodium benzoate solution? K_b (C₇H₅O₂^-) = 1.5 × 10^-10

What is the value of K_b for the cyanide anion, CN^-? K_a(HCN) = 6.2 × 10^-10

What is the value of K_b for the formate anion, HCOO^- ? K_a (HCOOH) = 2.1 × 10^-4

Calculate the pH of a 0.021 M NaCN solution. [K_a(HCN) = 4.9 × 10^-10]

Calculate the concentration of malonate ion (C₃H₂O₄^2-) in a 0.200 M solution of malonic acid (C₃H₄O₄) . (For malonic acid, K_a1 = 1.4 × 10^-3, K_a2 = 2.0 × 10^-6.)

For H₃PO₄, K_a1 = 7.3 × 10^-3, K_a2 = 6.2 × 10^-6, and K_a3 = 4.8 × 10^-13. A 0.10 M aqueous solution of NaH₂PO₄ therefore would be ________.

What are the products of hydrolysis of NH₄Cl?