1.

State and derive Ostwaid dilution law for a weak electrolyte.

Answer»

SOLUTION :At constant temperature the degree of dissociation of weak electrolyte PROCESS with dilution in such a way that the value of the `(alpah^2 c)/(1- alpha)` remains constant.
LET US CONSIDER weak acid
`HA leftrightarrow H^(+)+ A^-`
c 0 0
`c-a c ca ca `
Initial concentration
Equilibrium concentration
Applying law of mass action
`K_a=([H^+][A^-])/([HA])`
`K_a=(ca times ca)/(c (1-a))=(c a^2)/(1-a)`


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