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What is H + in a solution that is 0.01 M in H C N and 0.02 M in NaCN? br /> ( K a for H C N = 6.2 × 1 0 - 10 )

Options

  1. A3.1 × 1 0 10
  2. B6.2 × 1 0 5
  3. C6.2 × 1 0 - 10
  4. D3.1 × 1 0 - 10

Correct answer

D. 3.1 × 1 0 - 10

Step-by-step solution

K a   =   H +   CN − HCN 6.2 × 1 0 - 10 = [ H + ] [ 0.02 ] [ 0.01 ] NaCN = CN − due to common ion effect H + = 6.2 × 1 0 - 10 × 0.01 0.02 = 3.1 × 1 0 - 10

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