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JEE Previous Year Question

$K_{a} for CH_{3} COOH is 1.8 \times 10^{- 5} and K_{b} for NH_{4} OH is 1.8 \times 10^{- 5} . The pH of ammonium acetate solution will be$

Topic: JEE PYQ

Answer: 7. Full step-by-step solution below.

Correct answer: 7

Solution

(7) pH = \frac{pK _{w} + pK _{a} - pK _{b}}{2} pK_{a} = pK_{b} \Rightarrow pH = \frac{pK _{w}}{2} = 7

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