If pK a = 4 and K a = Cα 2 , then find van't Hoff factor for a weak HA type acid, when C = 0 . 01 M .

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Question: Answered & Verified by Expert

If

{pK}_{a} = 4

and

K_{a} = {Cα}^{2}

, then find van't Hoff factor for a weak HA type acid, when

C = 0.01 M

.

ChemistrySolutionsNEET

Options:

A $1.01$
B $1.02$
C $1.10$
D $1.20$

Solution:

2964 Upvotes Verified Answer

The correct answer is:

1.10

$K_{a} = {Cα}^{2}$

$10^{- 4} = 10^{- 2} \times α^{2}$

$α = 0.1$

$i = 1 + α = 1.1$

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