A) 4.74
B) 6.74
C) 7.74
D) 7.00
Correct Answer: D
Solution :
Ammonium acetate \[(C{{H}_{3}}COON{{H}_{4}})\] is a salt of weak acid and weak base. \[pH=7+\frac{1}{2}\,(p{{K}_{a}}-p{{K}_{b}})\] Given that, \[p{{K}_{a}}=p{{K}_{b}}=4.74\] Putting that values, we get \[pH=7+\frac{1}{2}\,(4.74-4.74)\] \[=7+0=7\]You need to login to perform this action.
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