jessicafoster73 jessicafoster73

Today at 9:25 PM
Chemistry

Answered

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.

Answer :

anfabba15 anfabba15

Today at 9:29 PM

Answer:

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

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