Question 1

HCN is classified as a weak acid in water.What does this classification mean?

Accepted Answer

A relatively small f...

Question 2

The substance NH3 is considered to be

Accepted Answer

A)  a weak acid.
B)  a weak base.
C)  a strong acid.
D)  a strong base.
E)  a neutral compound.

Question 3

What is the name of a proton donor in an acid-base reaction?

Accepted Answer

A)  Arrhenius acid
B)  Arrhenius base
C)  Brønsted acid
D)  Brønsted base
E)  Lewis base

Question 4

Which is a Lewis base?

Accepted Answer

A)  BCl3
B)  Cu2+
C)  Cl-
D)  Mn2+
E)  NH4+

Question 5

What is the H+ ion concentration in a 2.1 × 10-4 M Ca(OH) 2 solution?

Accepted Answer

A)  7.3 × 10-4 M
B)  4.2 × 10-4 M
C)  2.1 × 10-4 M
D)  2.4 × 10-11 M
E)  4.8 × 10-11 M

Question 6

Which one of the following is a strong base?

Accepted Answer

A)  LiOH
B)  CH3COOH
C)  NH3
D)  H3PO4
E)  HClO2

Question 7

What is the conjugate acid of NH3?

Accepted Answer

A)  NH2
B)  NH2+
C)  NH2-
D)  NH4
E)  NH4+

Question 8

After a substance acting as a strong base reacts,what remains of the base?

Accepted Answer

A)  a weaker base
B)  a strong conjugate acid
C)  a strong conjugate base
D)  a strong acid
E)  a weak conjugate acid

Question 9

Hydroxylamine,HONH2,readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps.Hydroxylamine has Kb = 9.1 × 10-9.What is the pH of a 0.025 M HONH2 solution?

Accepted Answer

A)  2.90
B)  4.82
C)  9.18
D)  9.91
E)  11.10

Question 10

What is the concentration of OH- in a 1.0 × 10-3 M Ba(OH) 2 solution?

Accepted Answer

A)  0.50 × 10-3 M
B)  1.0 × 10-3 M
C)  2.0 × 10-3 M
D)  1.0 × 10-2 M
E)  3.3 × 10-4 M

Question 11

What is the pOH of a 0.025 M HI solution?

Accepted Answer

A)  0.025
B)  0.94
C)  1.60
D)  12.40
E)  10.31

Question 12

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 _____.

Accepted Answer

A)  neutral
B)  weakly basic
C)  weakly acidic
D)  strongly acidic
E)  strongly basic

Question 13

Farmers who raise cotton once used arsenic acid,H3AsO4,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with Ka1 = 2.5 × 10-4,Ka2 = 5.6 × 10-8,and Ka3 = 3 × 10-13.What is the pH of a 0.500 M solution of arsenic acid?

Accepted Answer

A)  0.85
B)  1.95
C)  3.90
D)  4.51
E)  None of these choices is correct.

Exam 16: Acids and Bases

HCN is classified as a weak acid in water.What does this classification mean?

Correct Answer
verified
A relatively small f...
View Answer

What is the conjugate acid of NH₃?

Correct Answer
verified

After a substance acting as a strong base reacts,what remains of the base?

Correct Answer
verified

Farmers who raise cotton once used arsenic acid,H₃AsO₄,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with K_a1 = 2.5 × 10^-⁴,K_a2 = 5.6 × 10^-⁸,and K_a3 = 3 × 10^-¹³.What is the pH of a 0.500 M solution of arsenic acid?

Correct Answer
verified

What is the name of a proton donor in an acid-base reaction?

Correct Answer
verified

Which one of the following is a strong base?

Correct Answer
verified

What is the concentration of OH^- in a 1.0 × 10^-³ M Ba(OH) ₂ solution?

Correct Answer
verified

What is the pOH of a 0.025 M HI solution?

Correct Answer
verified

The substance NH₃ is considered to be

Correct Answer
verified

Hydroxylamine,HONH₂,readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps.Hydroxylamine has K_b = 9.1 × 10^-⁹.What is the pH of a 0.025 M HONH₂solution?

Correct Answer
verified

Which is a Lewis base?

Correct Answer
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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 _____.

Correct Answer
verified

What is the H⁺ ion concentration in a 2.1 × 10^-4 M Ca(OH) ₂ solution?

Correct Answer
verified

Exam 16: Acids and Bases

HCN is classified as a weak acid in water.What does this classification mean?

Correct AnswerverifiedA relatively small f...View AnswerShow Answer

What is the conjugate acid of NH3?

Correct AnswerverifiedShow Answer

After a substance acting as a strong base reacts,what remains of the base?

Correct AnswerverifiedShow Answer

Farmers who raise cotton once used arsenic acid,H3AsO4,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with Ka1 = 2.5 × 10-4,Ka2 = 5.6 × 10-8,and Ka3 = 3 × 10-13.What is the pH of a 0.500 M solution of arsenic acid?

Correct AnswerverifiedShow Answer

What is the name of a proton donor in an acid-base reaction?

Correct AnswerverifiedShow Answer

Which one of the following is a strong base?

Correct AnswerverifiedShow Answer

What is the concentration of OH- in a 1.0 × 10-3 M Ba(OH) 2 solution?

Correct AnswerverifiedShow Answer

What is the pOH of a 0.025 M HI solution?

Correct AnswerverifiedShow Answer

The substance NH3 is considered to be

Correct AnswerverifiedShow Answer

Hydroxylamine,HONH2,readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps.Hydroxylamine has Kb = 9.1 × 10-9.What is the pH of a 0.025 M HONH2 solution?

Correct AnswerverifiedShow Answer

Which is a Lewis base?

Correct AnswerverifiedShow Answer

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 _____.

Correct AnswerverifiedShow Answer

What is the H+ ion concentration in a 2.1 × 10-4 M Ca(OH) 2 solution?

Correct AnswerverifiedShow Answer

Correct Answer
verified
A relatively small f...
View Answer

What is the conjugate acid of NH₃?

Correct Answer
verified

Correct Answer
verified

Farmers who raise cotton once used arsenic acid,H₃AsO₄,as a defoliant at harvest time.Arsenic acid is a polyprotic acid with K_a1 = 2.5 × 10^-⁴,K_a2 = 5.6 × 10^-⁸,and K_a3 = 3 × 10^-¹³.What is the pH of a 0.500 M solution of arsenic acid?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the concentration of OH^- in a 1.0 × 10^-³ M Ba(OH) ₂ solution?

Correct Answer
verified

Correct Answer
verified

The substance NH₃ is considered to be

Correct Answer
verified

Hydroxylamine,HONH₂,readily forms salts such as hydroxylamine hydrochloride which are used as antioxidants in soaps.Hydroxylamine has K_b = 9.1 × 10^-⁹.What is the pH of a 0.025 M HONH₂solution?

Correct Answer
verified

Correct Answer
verified

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 _____.

Correct Answer
verified

What is the H⁺ ion concentration in a 2.1 × 10^-4 M Ca(OH) ₂ solution?

Correct Answer
verified