1.

0.2 molar solution of formic acid is ionized 3.2%. Its ionizationconstant is

Answer»

`9.6 XX 10^(-3)`
`2.1 xx 10^(-4)`
`1.25 xx 10^(-6)`
`4.8 xx 10^(-5)`

SOLUTION :`K_(a) = C ALPHA^(2) = 0.2 xx ((3.2)/(100))^(2) = 2.048 xx 10^(-4) = 2.1 xx 10^(-4)`.


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