1.

An acid HA ionises as HA hArr H^(+)+A^(-)The pH of 1.0 M solution is 5. Its dissociation constant would be :

Answer»

5
`5xx10^(-8)`
`1XX10^(-5)`
`1xx10^(-10)`

SOLUTION :`pH=5`
`[H^(+)]=10^(-5) ""[H^(+)]=SQRT(K_(a)C)`
or `K_(a)=([H^(+)]^(2))/(C )=((1xx10^(-5))^(2))/(1.0)=1xx10^(-10)`


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