Question

The pKa of acetic acidand ammonium hydroxide are 4.76 and 4.75 respectively.calculate pHof ammonium acetate soln.

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Answer 1

AnswEr:-

Concept:-

▶ The degree of hydrolysis is independent of solution .

▶pH of such solutions is determined by their pK values :

❥ $\sf \pink{pH = 7+1/2(pK_a - pK_b )}$

▶ The pH of solution can be greater than 7,if the difference is positive .

▶ It is less than 7 if diff is negative .

Solution:-

➮ pH = 7+1/2[pKa - pKb ]

➮ 7 + 1/2 [4.76 -4.75]

➮ 7 + 1/2 [0.01]

➮ 7 + 0.005 = 7.005

∴ $\boxed {\sf {\pink{pH=7.005}}$

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Answer 2

The degree of hydrolysis is independent of solution .

▶pH of such solutions is determined by their pK values :

❥  

▶ The pH of solution can be greater than 7,if the difference is positive .

▶ It is less than 7 if diff is negative .

Solution:-

➮ pH = 7+1/2[pKa - pKb ]

➮ 7 + 1/2 [4.76 -4.75]

➮ 7 + 1/2 [0.01]

➮ 7 + 0.005 = 7.005

∴  

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