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40 mL of 0.1 M ammonia solution is mixed with 20 mL of 0.1 M HCl. What is the pH of the mixture? (pKb of ammonia solution is 4.74) 

(a) 4.74 

(b) 2.26 

(c) 9.26 

(d) 5.00

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1 Answer

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The correct option is (c) 9.26.

Explanation:

According to the Henderson-Hasselbach equation, pH of such buffer solution can be calculated as:

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