Calculate [OH-] for each solution.

1. pH = 13.48

Express your answer using two significant figures.

2. pH = 8.19

Express your answer using two significant figures.

3. pH = 2.12

Express your answer using two significant figures.

1. [OH⁻] = 0.30 M; 2. [OH⁻] = 1.54x10⁻⁶M; 3. [OH⁻] = 1.32x10⁻¹³M

Explanation:

Remember the rule:

pH + pOH = 14

pOH = 14 - pH

10*⁻pOH (you have to elevate 10, to - pOH)

10*⁻pOH = [OH⁻]

1. 14 - 13.48 = 0.52

10⁻⁰°⁵² = 0.30

2. 14 - 8.19 = 5.81

10⁻⁵°⁸¹ = 1.54x10⁻⁶

3. 14 - 2.12 = 12.88

10⁻¹²°⁸⁸ = 1.32x10⁻¹³