1.

The hydrogen ion concentration in weak acid of dissociation constant K_(a) and concentration c is nearly equal to (1)

Answer»

`sqrt(K_(a)//c)`
`c//K_(a)`
`K_(a)c`
`sqrt(K_(a)c)`

Solution :`{:(HA,RARR,H^(+),+,A^(-)),(C(1-alpha),,C alpha,,C alpha):}`
Hydrogen ion CONCENTRATION `[H^(+)] = C alpha` ....(i)
By the ostwald's law `alpha= sqrt((K_(a))/(C))` ...(II)
By putting this value in equation (i) we GET
`rArr c xx sqrt((K_(a))/(C)) = sqrt(K_(a)C)`.


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