# What is the [H+] of a solution with a pH of 5.6?

13. What is the [H+] of a solution with a pH of 5.6? Use a scientific calculator.

(Points: 3)

   5.0 × 105

8.3 × 106

2.5 × 106

7.7 × 105

Which of the following [H+] values describes the most basic (alkaline) solution?

(Points: 3)

   101 M

107 M

1012 M

1014 M

Lemon juice is a weak acid. It has a [H+] of 5.0 × 102 M. What is the pH of lemon juice? Use a scientific calculator.

(Points: 3)

   1.0

1.3

1.0

2.5
1. Pyridine is a weak base with the formula C5H5N. Pyridine reacts with water according to the following equation: C5H5N + H2O C5H5NH+ + OH. What is the formula for the dissociation constant for this base?

(Points: 3)

   Kb = [H+][CO2H]/[C5H5N]

Kb = [C5H5N]/[OH][CO2H]

Kb = [C5H5N][CO2H]/[OH]

Kb = [OH][C5H5NH+]/[C5H5N]



### 1 Answer

• H+]= 10^-5.6 =2.5 x 10^-6 M

10^-14 M

pH = - log 5.0 x 10^-2 =1.3

Kb = [OH-][C5H5NH+] / [C5H5N]