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VITEEE 2009 Solved Paper
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© examsnet.com
Question : 60
Total: 120
pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 ml of a buffer solution of acetic acid and potassium acetate at 27°C . The buffer capacity of the solution is
0.1
10
1
0.4
Validate
Solution:
Buffer capacity,
β
=
dC
HA
d
pH
,
where,
dC
HA
= no. of moles of acid added per litre
d
pH
= change in pH
dC
HA
=
moles
of
acetic
acid
volume
=
0.12
∕
60
250
∕
1000
=
1
125
∴
β
=
1
∕
125
0.02
=
1
2.5
=
0.4
© examsnet.com
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