# PH worksheet (#1).

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pH worksheet (#1)

1. What is the pH of a solution with a hydrogen ion concentration of 1
1. What is the pH of a solution with a hydrogen ion concentration of 1.0 x 10-5 M? pH = -log [H+] = - log (1.0 x 10-5 ) = 5

2. What is the pH of a solution with a hydrogen ion concentration of 4
2. What is the pH of a solution with a hydrogen ion concentration of 4.5 x 10-8 M? pH = -log [H+] = - log (4.5 x 10-8 ) = 7.34

3. What is the pOH of a solution with a hydrogen ion concentration of 1.0 x 10-10 M?
pH = -log [H+] = - log (1.0 x ) = 10 Now use: pH + pOH = 14 14 – 10 = 4, so the pOH = 4

We need to use: pOH = - log [OH-]
4. What is the pOH of a solution with a hydroxide ion concentration of 1.0 x M? We need to use: pOH = - log [OH-] pOH = - log [1.0 x ] pOH = 10

5. What is the hydroxide ion concentration in a solution with a pH of 5?
pH = - log [ H+] - pH = log [ H+] 10x (- pH) = 10x log [ H+] 10x (- 5) = 10x log [ H+] 10-5 = [ H+] = 1.0 x M

This is our [H+], we need [OH-]
We need to use: [H+] x [OH-] = 1.0 x M [1.0 x M] x [OH-] = 1.0 x M [1.0 x M] [1.0 x M] = 1.0 x 10 -9

6. What is the hydrogen ion concentration in a solution with a pH of 9
pH = - log [ H+] - pH = log [ H+] 10x (- pH) = 10x log [ H+] 10x (- 9.7) = 10x log [ H+] = [ H+] = 2.0 x M

7. What is the hydronium ion concentration of a solution with a pH of 2.5?
pH = - log [ H+] - pH = log [ H+] 10x (- pH) = 10x log [ H+] 10x (- 2.5) = 10x log [ H+] = [ H+] = 3.2 x M

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