Question 1

The value of K_a for a 0.250 M HCN solution having a pH of 4.956 is ________.

Accepted Answer

The answer of The value of K_a for a 0.250...

Question 2

In order for the reaction A^- + H₂CO₃ ⇌ HA + HCO₃^- to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of H₂CO₃.

Accepted Answer

The answer of In order for the reaction A^- +...

Question 3

The number of waters of hydration in the hydrate proton H₇O₃⁺ is ________.

Accepted Answer

The answer of The number of waters of hydration in...

Question 4

Undersea flora prefer a maximum concentration of OH^- of 1.58 × 10^-5.The concentration of H₃O⁺ in the seawater is ________,and this solution is ________ (acidic,basic,neutral).

Accepted Answer

The answer of Undersea flora prefer a maximum concentration of...

Question 5

One way to prepare a solution with a pH of 10.00 is to dissolve ________ grams of CaO in enough water to make 500 mL of solution.

Accepted Answer

The answer of One way to prepare a solution with...

Question 6

Phenobarbital is an antiepileptic drug with a water solubility of 4.3 × 10^-3 M and pK_a = 7.4.What is the pH and percent ionization of 4.3 × 10^-3 M phenobarbital?

Accepted Answer

The answer of Phenobarbital is an antiepileptic drug with a...

Question 7

The pH of a 0.025 M KOH solution is ________.

Accepted Answer

The answer of The pH of a 0.025 M KOH...

Question 8

At the normal body temperature of 37°C,K_w = 2.42 × 10^-14.The H₃O⁺ concentration of normal blood ranges from 3.5 × 10^-8 to 4.5 × 10^-8.The OH^- concentration of normal blood ranges from ________ to ________,and blood is ________ (acidic,basic,neutral).

Accepted Answer

The answer of At the normal body temperature of 37°C,K_w...

Question 9

Bromothymol blue indicator changes color from yellow at a pH of 6.0 to blue at a pH of 7.6.Phenol red indicator changes color from yellow at a pH of 6.8 to red at a pH of 8.4.A sample of pancreatic fluid having [OH^-] = 1.258 × 10^-6 would impart a ________ color to bromothymol blue and a ________ color to phenol red.

Accepted Answer

The answer of Bromothymol blue indicator changes color from yellow...

Question 10

Bromothymol blue indicator changes color from yellow at a pH of 6.0 to blue at a pH of 7.6.Methyl red indicator changes color from red at a pH of 4.4 to yellow at a pH of 6.2.A sample of saliva having [H₃O⁺] = 6.310 × 10^-7 would impart a ________ color to bromothymol blue and a ________ color to methyl red.

Accepted Answer

The answer of Bromothymol blue indicator changes color from yellow...

Question 11

In order for the reaction HA + HSO₃^- ⇌ A^- + H₂SO₃ to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of HSO₃^-.

Accepted Answer

The answer of In order for the reaction HA +...

Question 12

At 50°C the value of K_w is 5.5 × 10^-14,and the pH of a neutral solution at 50°C is ________.

Accepted Answer

The answer of At 50°C the value of K_w is...

Question 13

The equilibrium constant for the reaction below has the value K_a = 3.5 × 10^-4.In this reaction the stronger Br∅nsted-Lowry acid is ________ and the weaker Br∅nsted-Lowry acid is ________. HF(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ F^-(aq)

Accepted Answer

The answer of The equilibrium constant for the reaction below...

Question 14

Phenobarbital has a pK_a = 7.4.Compared to a 1.0 × 10^-3 M solution,1.0 × 10^-4 M phenobarbital will have a ________ (higher,lower)pH and a ________ (higher,lower)percent ionization.

Accepted Answer

The answer of Phenobarbital has a pK_a = 7.4.Compared to...

Question 15

Erythromycin is a basic antimicrobial with pK_b = 5.2.A 1.0 × 10^-3 M solution of erythromycin has a pH of and a percent ionization.

Accepted Answer

The answer of Erythromycin is a basic antimicrobial with pK_b...

Question 16

A proton hydrated by four water molecules has the formula ________.

Accepted Answer

The answer of A proton hydrated by four water molecules...

Question 17

A 1.25 × 10^-4 M solution of the anti-inflammatory drug naproxen has a pH = 4.2.The K_a and pK_a of naproxen are ________ and ________.

Accepted Answer

The answer of A 1.25 × 10^-4 M solution of...

Question 18

An acidic solution with hydronium ion concentration [H⁺] = 1.60 × 10^-3 M has a hydroxide ion concentration [OH^-] = ________.

Accepted Answer

The answer of An acidic solution with hydronium ion concentration...

Question 19

The concentration of H₃O⁺ in human sweat can be as low as 2.5 × 10^-6.The concentration of OH^- in the sweat is ________,and this solution is ________ (acidic,basic,neutral).

Accepted Answer

The answer of The concentration of H₃O⁺ in human sweat...

Question 20

A 0.050 M solution of hydroxylamine,NH₂OH,having K_b = 9.1 × 10^-9 has a pH of ________.

Accepted Answer

The answer of A 0.050 M solution of hydroxylamine,NH₂OH,having K_b...

Quiz 14: Aqueous Equilibria: Acids and Bases

The value of K_a for a 0.250 M HCN solution having a pH of 4.956 is ________.

In order for the reaction A^- + H₂CO₃ ⇌ HA + HCO₃^- to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of H₂CO₃.

The number of waters of hydration in the hydrate proton H₇O₃⁺ is ________.

Undersea flora prefer a maximum concentration of OH^- of 1.58 × 10^-5.The concentration of H₃O⁺ in the seawater is ,and this solution is (acidic,basic,neutral).

One way to prepare a solution with a pH of 10.00 is to dissolve ________ grams of CaO in enough water to make 500 mL of solution.

Phenobarbital is an antiepileptic drug with a water solubility of 4.3 × 10^-3 M and pK_a = 7.4.What is the pH and percent ionization of 4.3 × 10^-3 M phenobarbital?

The pH of a 0.025 M KOH solution is ________.

At the normal body temperature of 37°C,K_w = 2.42 × 10^-14.The H₃O⁺ concentration of normal blood ranges from 3.5 × 10^-8 to 4.5 × 10^-8.The OH^- concentration of normal blood ranges from to ,and blood is (acidic,basic,neutral).

Bromothymol blue indicator changes color from yellow at a pH of 6.0 to blue at a pH of 7.6.Methyl red indicator changes color from red at a pH of 4.4 to yellow at a pH of 6.2.A sample of saliva having [H₃O⁺] = 6.310 × 10^-7 would impart a color to bromothymol blue and a color to methyl red.

In order for the reaction HA + HSO₃^- ⇌ A^- + H₂SO₃ to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of HSO₃^-.

At 50°C the value of K_w is 5.5 × 10^-14,and the pH of a neutral solution at 50°C is ________.

The equilibrium constant for the reaction below has the value K_a = 3.5 × 10^-4.In this reaction the stronger Br∅nsted-Lowry acid is and the weaker Br∅nsted-Lowry acid is . HF(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ F^-(aq)

Phenobarbital has a pK_a = 7.4.Compared to a 1.0 × 10^-3 M solution,1.0 × 10^-4 M phenobarbital will have a (higher,lower)pH and a (higher,lower)percent ionization.

Erythromycin is a basic antimicrobial with pK_b = 5.2.A 1.0 × 10^-3 M solution of erythromycin has a pH of and a percent ionization.

A proton hydrated by four water molecules has the formula ________.

A 1.25 × 10^-4 M solution of the anti-inflammatory drug naproxen has a pH = 4.2.The K_a and pK_a of naproxen are and .

An acidic solution with hydronium ion concentration [H⁺] = 1.60 × 10^-3 M has a hydroxide ion concentration [OH^-] = ________.

The concentration of H₃O⁺ in human sweat can be as low as 2.5 × 10^-6.The concentration of OH^- in the sweat is ,and this solution is (acidic,basic,neutral).

A 0.050 M solution of hydroxylamine,NH₂OH,having K_b = 9.1 × 10^-9 has a pH of ________.

Quiz 14: Aqueous Equilibria: Acids and Bases

The value of Ka for a 0.250 M HCN solution having a pH of 4.956 is ________.

In order for the reaction A- + H2CO3 ⇌ HA + HCO3- to have an equilibrium constant Kc < 1,the Ka of HA must be ________ (greater,less)than the Ka of H2CO3.

The number of waters of hydration in the hydrate proton H7O3+ is ________.

Undersea flora prefer a maximum concentration of OH- of 1.58 × 10-5.The concentration of H3O+ in the seawater is ________,and this solution is ________ (acidic,basic,neutral).

One way to prepare a solution with a pH of 10.00 is to dissolve ________ grams of CaO in enough water to make 500 mL of solution.

Phenobarbital is an antiepileptic drug with a water solubility of 4.3 × 10-3 M and pKa = 7.4.What is the pH and percent ionization of 4.3 × 10-3 M phenobarbital?

The pH of a 0.025 M KOH solution is ________.

At the normal body temperature of 37°C,Kw = 2.42 × 10-14.The H3O+ concentration of normal blood ranges from 3.5 × 10-8 to 4.5 × 10-8.The OH- concentration of normal blood ranges from ________ to ________,and blood is ________ (acidic,basic,neutral).

In order for the reaction HA + HSO3- ⇌ A- + H2SO3 to have an equilibrium constant Kc < 1,the Ka of HA must be ________ (greater,less)than the Ka of HSO3-.

At 50°C the value of Kw is 5.5 × 10-14,and the pH of a neutral solution at 50°C is ________.

The equilibrium constant for the reaction below has the value Ka = 3.5 × 10-4.In this reaction the stronger Br∅nsted-Lowry acid is ________ and the weaker Br∅nsted-Lowry acid is ________. HF(aq)+ H2O(l)⇌ H3O+(aq)+ F-(aq)

Phenobarbital has a pKa = 7.4.Compared to a 1.0 × 10-3 M solution,1.0 × 10-4 M phenobarbital will have a ________ (higher,lower)pH and a ________ (higher,lower)percent ionization.

Erythromycin is a basic antimicrobial with pKb = 5.2.A 1.0 × 10-3 M solution of erythromycin has a pH of and a percent ionization.

A proton hydrated by four water molecules has the formula ________.

A 1.25 × 10-4 M solution of the anti-inflammatory drug naproxen has a pH = 4.2.The Ka and pKa of naproxen are ________ and ________.

An acidic solution with hydronium ion concentration [H+] = 1.60 × 10-3 M has a hydroxide ion concentration [OH-] = ________.

The concentration of H3O+ in human sweat can be as low as 2.5 × 10-6.The concentration of OH- in the sweat is ________,and this solution is ________ (acidic,basic,neutral).

A 0.050 M solution of hydroxylamine,NH2OH,having Kb = 9.1 × 10-9 has a pH of ________.

The value of K_a for a 0.250 M HCN solution having a pH of 4.956 is ________.

In order for the reaction A^- + H₂CO₃ ⇌ HA + HCO₃^- to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of H₂CO₃.

The number of waters of hydration in the hydrate proton H₇O₃⁺ is ________.

Undersea flora prefer a maximum concentration of OH^- of 1.58 × 10^-5.The concentration of H₃O⁺ in the seawater is ,and this solution is (acidic,basic,neutral).

Phenobarbital is an antiepileptic drug with a water solubility of 4.3 × 10^-3 M and pK_a = 7.4.What is the pH and percent ionization of 4.3 × 10^-3 M phenobarbital?

At the normal body temperature of 37°C,K_w = 2.42 × 10^-14.The H₃O⁺ concentration of normal blood ranges from 3.5 × 10^-8 to 4.5 × 10^-8.The OH^- concentration of normal blood ranges from to ,and blood is (acidic,basic,neutral).

In order for the reaction HA + HSO₃^- ⇌ A^- + H₂SO₃ to have an equilibrium constant K_c < 1,the K_a of HA must be ________ (greater,less)than the K_a of HSO₃^-.

At 50°C the value of K_w is 5.5 × 10^-14,and the pH of a neutral solution at 50°C is ________.

The equilibrium constant for the reaction below has the value K_a = 3.5 × 10^-4.In this reaction the stronger Br∅nsted-Lowry acid is and the weaker Br∅nsted-Lowry acid is . HF(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ F^-(aq)

Phenobarbital has a pK_a = 7.4.Compared to a 1.0 × 10^-3 M solution,1.0 × 10^-4 M phenobarbital will have a (higher,lower)pH and a (higher,lower)percent ionization.

Erythromycin is a basic antimicrobial with pK_b = 5.2.A 1.0 × 10^-3 M solution of erythromycin has a pH of and a percent ionization.

A 1.25 × 10^-4 M solution of the anti-inflammatory drug naproxen has a pH = 4.2.The K_a and pK_a of naproxen are and .

An acidic solution with hydronium ion concentration [H⁺] = 1.60 × 10^-3 M has a hydroxide ion concentration [OH^-] = ________.

The concentration of H₃O⁺ in human sweat can be as low as 2.5 × 10^-6.The concentration of OH^- in the sweat is ,and this solution is (acidic,basic,neutral).

A 0.050 M solution of hydroxylamine,NH₂OH,having K_b = 9.1 × 10^-9 has a pH of ________.