31 6.3 The pH Scale

Practice questions

1. 1. 1. What is pH?
         1. 1. pH is the negative logarithm of [latex]\ce{[OH^{-}]}[/latex]
            2. pH is the negative logarithm of [latex]\ce{[H^{+}]}[/latex]
            3. pH is the logarithm of [latex]\ce{[H^{+}]}[/latex]
            4. pH is the logarithm of [latex]\ce{[OH^{-}]}[/latex]
      2. What is the pH range for an acidic solution?
         1. 1. [latex]\ce{pH=7}[/latex]
            2. [latex]\ce{pH<7}[/latex]
            3. [latex]\ce{pH>7}[/latex]
            4. [latex]\ce{pH=14}[/latex]
      3. What is the pH range for a basic solution?
         1. 1. [latex]\ce{pH=7}[/latex]
            2. [latex]\ce{pH<7}[/latex]
            3. [latex]\ce{pH>7}[/latex]
            4. [latex]\ce{pH=1}[/latex]
      4. What is [latex]\ce{[H^{+}]}[/latex]
         1. 1. [latex]{1.0{\times}10^{-7}M}[/latex]
            2. [latex]{1.0{\times}10^{-14}M}[/latex]
            3. [latex]{1.0{\times}10^{-1}M}[/latex]
            4. [latex]{1.0{\times}10^{-8}M}[/latex]
      5. What is the pH of a solution when [latex]\ce{[H^{+}]}[/latex] is [latex]{3.44{\times}10^{-4}M ?}[/latex]
         1. 1. pH of 3.6
            2. [latex]{1.0{\times}10^{-4}M}[/latex]
            3. pH of 4
            4. pH of 8
      6. What is the pH of a solution when [latex]\ce{[OH^{-}]}[/latex] is [latex]{6.22{\times}10^{-7}M ?}[/latex]
         1. 1. pH of 0.79
            2. pH of 2
            3. pH of 7.79
            4. pH of 6
      7. What is the pOH of a solution when [latex]\ce{[H^{+}]}[/latex] is [latex]{3.44{\times}10^{-4}M ?}[/latex]
         1. 1. pOH of 1.89
            2. pOH of 10.54
            3. pOH of 3.46
            4. pOH of 0.54
      8. What is the pOH of a solution when [latex]\ce{[OH^{-}]}[/latex] is [latex]{6.22{\times}10^{-7}M ?}[/latex]
         1. 1. pOH of 3.46
            2. pOH of 7.79
            3. pOH of 6.21
            4. pOH of 7
      9. If a solution has a pH of [latex]{0.77}[/latex], what is its pOH, [latex]\ce{[H^{+}]}[/latex], and [latex]\ce{[OH^{-}]}[/latex]?
      10. If a solution has a pOH of [latex]{13.9}[/latex], what is its pH, [latex]\ce{[H^{+}]}[/latex], and [latex]\ce{[OH^{-}]}[/latex]?

Answers

1. b
2. b
3. c
4. a
5. a
6. c
7. b
8. c
9. [latex]{pOH=13.23}[/latex], [latex]\ce{{[H^{+}]} = 1.70{\times}10^{-1}M}[/latex], [latex]\ce{{[OH^{-}]} = 5.89{\times}10^{-14}}[/latex]
10. [latex]{pH=0.91}[/latex], [latex]\ce{{[H^{+}]} = 8.13{\times}10^{-14}}M[/latex], [latex]\ce{{[OH^{-}]} = 0.12M}[/latex]