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Q.

The degree of hydrolysis of 0.1 M solution of conjugate base of HA is 0.01.

Find the H+ concentration in 0.4 M solution of A- :

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a

5 x 10-12 M

b

2 x 10-4 M

c

5 x 10-11 M

d

2 x 10-3 M

answer is B.

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Detailed Solution

Kh=ch2=0.1×10−4=10−5

10−5=OH−20.4⇒OH−=2×10−3

or,

H+=5×10−12

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The degree of hydrolysis of 0.1 M solution of conjugate base of HA is 0.01.Find the H+ concentration in 0.4 M solution of A- :