Question 1

Which of the following acids (listed with Ka values) and their conjugate base would form a buffer with a pH of 2.34?

Accepted Answer

HClO₂, Ka = 1.1 x 10^-2

Answer

HClO, Ka = 2.9 x 10^-8

Answer

HF, Ka = 3.5 x 10^-4

Answer

HCN, Ka = 4.9 x 10^-10

Answer

HC₇H₅O₂, Ka = 6.5 x 10^-5

Question 2

Which of the following solutions is a good buffer system?

Accepted Answer

A solution that is 0.10 M HCN and 0.10 M LiCN

Answer

A solution that is 0.10 M NaCl and 0.10 M HCl

Answer

A solution that is 0.10 M HNO3 and 0.10 M KNO3

Answer

A solution that is 0.10 M HCN and 0.10 M NaCl

Answer

A solution that is 0.10 M NaOH and 0.10 M HNO3

Question 3

What is the concentration of hydroxide ions in pure water at 30.0∘C, if Kw at this temperature is 1.47E-14 (in M)?

Accepted Answer

1.21E-7

Question 4

Determine the pH of a 0.023 M HNO₃ solution.

Accepted Answer

1.64

Question 5

How many of the following are WEAK acids?

HCN HClO₂ HNO₃ H₂PO₄⁻

Accepted Answer

3

Question 6

Identify the triprotic acid.

Accepted Answer

H3PO4

Answer

HClO4

Answer

HNO3

Answer

H2SO4

Answer

H2SO3

Question 7

The weaker the acid, then which of the following is TRUE?

Accepted Answer

The stronger the conjugate base.

Answer

The weaker the conjugate base.

Answer

The weaker the conjugate acid.

Answer

The stronger the conjugate acid.

Question 8

Determine the pH of a 0.22 M NaF solution at 25°C. The Ka of HF is 3.5 E10-5.

Accepted Answer

8.90

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