By Team Aakash Byju's | 17th December 2022
pK of acetic acid and pK of ammonium hydroxide are 4.76 and 4.75 respectively. Calculate the pH of the ammonium acetate solution.
a
b
8
Detailed Explanation
Given the pK of acetic acid (CH COOH) =4.76 and pK of ammonium hydroxide (NH OH) = 4.75.
a
3
4
b
Ammonium acetate (CH COONH ) is a salt of a weak acid, acetic acid (CH COOH), and a weak base ammonium hydroxide (NH OH).
Step 1: Salt type
3
4
3
4
The reaction taking place is:
3
3
4
4
2
Step 2: Formula of pH
For salt of a weak acid and weak base, the pH of salt in solution is given as:
a
b
pH=7+1 [pK –pK ].
2
Step 3: pH value
pH=7+ [0.01]
a
b
pH=7+ [pK –pK ]
2
2
pH=7.005.
pH=7+0.005
=>
1
1