1.

pH of a saturated solution of silver salt of monobasic acid HA is found to be 9. Find the K_(sp) of sparingly soluble salt Ag A(s). Given : K_(a)(HA)=10^(-10) Express your answer as a, b, c, d where K_(sp)=a.bxx10^(cd) [Written in scientific notation]

Answer»


Solution :`{:(AGA(s)hArrAg^(+)(aq)+A^(-)(aq)),(""x""x-y):}`
`{:(AgA(s)+H_(2)O(l)hArrHA(aq)+OH^(-)(aq)),(x-y""y""y):}`
`K_(sp)=x(x-y)`
`K_(H)=(K_(w))/(K_(a))=(y^(2))/((x-y))`
`(10^(-10))/(10^(-10))=((10^(-5))^(2))/((x-y))`
`x-y=10^(-6)`
`x=10^(-5)+10^(-6)`
`x=1.1xx10^(-5)`
`K_(sp)=1.1xx10^(-5)xx10^(-6)`
`K_(sp)=1.1xx10^(11)`Ans.


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