Question

What is the pH of a 6.85 × 10⁻³ M weak acid solution, HA, if K_a = 4.5 × 10⁻⁶?

Group of answer choices

1.2

4.8

9.1

3.8

6.5

What is the pOH of 4.50 × 10⁻⁴M HBr?

Group of answer choices

10.7

6.7

1.7

12.3

3.3

What is the pH of a 9.67 × 10⁻³M solution of NaOH?

Group of answer choices

13.0

4.6

12.0

9.4

2.0

A 6.5 × 10^-2 M solution of a weak acid, HA, has a pH of 3.25. What is the K_b for the conjugate of this weak acid?

Group of answer choices

3.7 × 10^-5

2.1 × 10^-9

2.7 × 10^-10

4.9 × 10^-6

1.2 × 10^-12

Calculate the equilibrium concentration of the [H⁺] in a 7.2 × 10^-3 M solution of HA that has a K_a of 5.45 × 10^-8.

Group of answer choices

3.92 × 10^-7

7.35 × 10^-3

8.49 × 10^-2

2.0 × 10^-5

6.30 × 10^-8

What is the pH of a 9.25 × 10^-2 M solution of NaF, a weakly basic salt?

Group of answer choices

11.89

5.93

8.07

9.82

4.18

Calculate the pH of 5.34 × 10^-8 M citric acid, H₃C₆H₅O₇.

Group of answer choices

4.27

5.20

3.01

6.84

9.73

Answer 1

I'm very sorry to say that according to the HOMEWORKLIB RULES we are allowed to solve only first question. Please co-operate. Thankyou.

1.

Option 4 (3.8) is the correct answer.