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The dissociation constant of acetic is x   ×   10 – 5   . When 25   mL   of   0 . 2   M   CH 3 COONa solution is mixed with 25   mL   of   0 . 02   M   CH 3 COOH solution, the pH of the resultant solution is found to be equal to 5 . The value of x is _______.

Correct answer

0

Step-by-step solution

The Henderson equation for the given acidic buffer can be written as pH = pKa + log salt weak   acid 5 = pKa + log 25 × 0 . 2 25 × 0 . 02 ⇒ pKa = 4 ⇒ Ka = 10 - 4 = 10 × 10 - 5 Hence, the value of x   is 10 .

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