Question 1

The number of waters of hydration in the hydrate proton H₁₁O₅⁺ is ________.

Accepted Answer

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

Question 2

The Br∅nsted-Lowry acids in the chemical equation below are ________ and ________. HNO₂(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ NO₂^-(aq)

Accepted Answer

The answer of The Br∅nsted-Lowry acids in the chemical equation...

Question 3

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 4

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

Accepted Answer

AlCl3, when dissolved in water, produces a solution with the lowest pH because it hydrolyzes to form Al(OH)3 and HCl, thereby releasing H+ ions into the solution and making it acidic.

Question 5

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 6

The pH of a 0.055 M KOH solution is ________.

Accepted Answer

The answer of The pH of a 0.055 M KOH...

Question 7

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

Accepted Answer

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

Question 8

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 9

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 10

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 11

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 12

The compound BCl₃ can be described as a(n)

Accepted Answer

The compound BCl₃ is a Lewis acid because it is electron deficient and can accept a pair of electrons from a Lewis base. It does not fit the definition of an Arrhenius acid or a Brønsted-Lowry base.

Question 13

Which one of the following is not considered to be a Lewis base?

Accepted Answer

Lewis bases are defined as species that can donate a pair of electrons. In the given options, A) HS^-, B) NH3, and D) Cl^- can all donate a pair of electrons. However, C) NH4^+ is a Lewis acid, not a base, because it can accept an electron pair, not donate one.

Question 14

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

Accepted Answer

LiF is a salt of a strong base (LiOH) and a weak acid (HF). When it is dissolved in water, it undergoes hydrolysis and releases F- ions, which react with water to form OH- ions. This results in an increase in pH, making it the salt that produces the highest pH solution when dissolved in water.

Question 15

Identify the set of Lewis acids.

Accepted Answer

Lewis acids are species that can accept a pair of electrons. BF3, BCl3, and Cu+ are examples of Lewis acids because they have vacant orbitals that can accept electron pairs. CO does not fit the typical definition of a Lewis acid as it is more commonly considered a Lewis base due to its ability to donate a pair of electrons.

Question 16

A solution with hydronium ion concentration [H⁺] = 1.60 × 10^-2 M has a hydroxide ion concentration [OH^-] = ________.

Accepted Answer

The answer of A solution with hydronium ion concentration [H⁺]...

Question 17

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 18

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 19

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 20

Which one of the following is least able to behave as a Lewis base?

Accepted Answer

Lewis bases are electron donors. Among the given structures, D has only one nitrogen atom with lone pair electrons available for donation as compared to A, B, and C, which have multiple nitrogen and sulfur atoms with available lone pairs. Hence, D is least able to behave as a Lewis base.

Quiz 15: Aqueous Equilibria: Acids and Bases

The number of waters of hydration in the hydrate proton H₁₁O₅⁺ is ________.

The Br∅nsted-Lowry acids in the chemical equation below are and . HNO₂(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ NO₂^-(aq)

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)

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

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 pH of a 0.055 M KOH solution is ________.

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

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

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).

The compound BCl₃ can be described as a(n)

Which one of the following is not considered to be a Lewis base?

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

Identify the set of Lewis acids.

A solution with hydronium ion concentration [H⁺] = 1.60 × 10^-2 M has a hydroxide ion concentration [OH^-] = ________.

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.

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.

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).

Which one of the following is least able to behave as a Lewis base?

Quiz 15: Aqueous Equilibria: Acids and Bases

The number of waters of hydration in the hydrate proton H11O5+ is ________.

The Br∅nsted-Lowry acids in the chemical equation below are ________ and ________. HNO2(aq)+ H2O(l)⇌ H3O+(aq)+ NO2-(aq)

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)

Which one of the following salts,when dissolved in water,produces the solution with the lowest pH?

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

The pH of a 0.055 M KOH solution is ________.

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

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

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).

The compound BCl3 can be described as a(n)

Which one of the following is not considered to be a Lewis base?

Which one of the following salts,when dissolved in water,produces the solution with the highest pH?

Identify the set of Lewis acids.

A solution with hydronium ion concentration [H+] = 1.60 × 10-2 M has a hydroxide ion concentration [OH-] = ________.

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.

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).

Which one of the following is least able to behave as a Lewis base?

The number of waters of hydration in the hydrate proton H₁₁O₅⁺ is ________.

The Br∅nsted-Lowry acids in the chemical equation below are and . HNO₂(aq)+ H₂O(l)⇌ H₃O⁺(aq)+ NO₂^-(aq)

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)

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 value of K_a for a 0.250 M HCN solution having a pH of 4.956 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).

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).

The compound BCl₃ can be described as a(n)

A solution with hydronium ion concentration [H⁺] = 1.60 × 10^-2 M has a hydroxide ion concentration [OH^-] = ________.

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).