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If the pK a of acetic acid and pK b of NH 4 OH are 4.76 and 4.75 respectively, what will be the pH of ammonium acetate solution?

Options

  1. A9.51
  2. B7.005
  3. C7.00
  4. D6.9

Correct answer

B. 7.005

Step-by-step solution

When a weak acid (acetic acid) and weak base NH 4 OH are mixed to form a solution. pH of the solution is then determined by following formula: pH = 7 + 1 2 pK a − pK b Given, pK a   =   4 .76,    pK b   =   4 .75 pH   =   7   +   1 2 4 .76 − 4 .75 pH   =   7   +   0 .005 pH   =   7 .005

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