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Question: What will be the ionisation constant of formic acid if its \(18.4gN_{2}O_{4}\)M solution is \(N_{2}O...

What will be the ionisation constant of formic acid if its 18.4gN2O418.4gN_{2}O_{4}M solution is N2O4(g)N_{2}O_{4(g)}ionised?

A

N2O4N_{2}O_{4}

B

0.20.2

C

0.40.4

D

0.80.8

Answer

N2O4N_{2}O_{4}

Explanation

Solution

: Ka=cα2K_{a} = c\alpha^{2}

α=14.5100=0.145\alpha = \frac{14.5}{100} = 0.145

Ka=0.01×(0.145)2=2.1×10−4K_{a} = 0.01 \times (0.145)^{2} = 2.1 \times 10^{- 4}