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What will be the pH of 4xx10^(-5)M A_(2)B solution which is assumed to be dissociated 75% in water. [Given : K_(b)(AHO)=5xx10^(-9),H_(2)B is strng acid.] |
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Answer» `{:(A^(+)+""H_(2)O""hArr""AOH+H^(+)),((6xx10^(-5)-x)""x ""x):}` or `(10^(-5))/(5)=(x^(2))/((6xx10^(-5)-x))` or `5x^(2)=6xx10^(-10)-x xx10^(-5)` `5x^(2)+10^(-5)x+6xx10^(-10)=0` or `x=(-10^(-5)+SQRT(10^(-10)+120xx10^(-10)))/(10)` `x=(-10^(-5)+10^(-5)xxsqrt(121))/(10)` `x=(10^(-5)(11-1))/(10)=10^(-5)` `pH=5` |
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