1.

0.2 molar solution of formic acid is ionized to 3.2 %. Its ionisation constant is :

Answer»

`9.6xx10^(-3)`
`2.05xx10^(-4)`
`1.25xx10^(-6)`
`4.8xx10^(-5)`

SOLUTION :`K_(a)=c alpha^(2), c = 0.2 M, alpha = (3.2)/(100)=0.032`
`K_(a)=0.2xx(0.032)^(2)=2.05xx10^(-4)`


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