1.

Accumulation of lactic acid (HC_(3)H_(5)O_(3)), a monobasic acid in tissues leads to pain and a feeling of fatigue. In a 0.10 M aqueous solution, lactic acid is 3.7% dissociates. The value of dissociation constant Ka, for this acid will be

Answer»

`1.4 xx 10^(-5)`
`1.4 xx 10^(-4)`
`3.7 xx 10^(-4)`
`2.8 xx 10^(-4)`

Solution :`ALPHA = SQRT((K_(a))/(C))`
`alpha^(2) = (K_(a))/(C)` or `K_(a) = C alpha6(2)`
`K_(a) = 0.10 xx ((3.7)/(100))^(2)`
`K_(a) = 1.4 xx 10^(-4)`


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