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A solution is prepared by mixing 10 ~mL of 1.0 M acetic acid and 20 ~mL of 0.5 M sodium acetate and diluted to 100 ~mL . If the pK _ a of acetic acid is 4.76 , then the pH of the solution is

Options

  1. A4.76
  2. B3.76
  3. C5.76
  4. D9.24

Correct answer

A. 4.76

Step-by-step solution

aligned & pH = pK _ a + [ salt ] [ Acid ] & [ Acid ]= [ CH ₃ COOH ]= 10 1 100 =0.1 M & [ Salt ]= [ CH ₃ COO ⁻ ]= 20 0.5 100 =0.1 M & pH =4.76+ 0.1 0.1 & =4.76 aligned

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