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Calculate [H^(+) ] in a 0.1 M solution ...

Calculate `[H^(+) ]` in a 0.1 M solution of dichloroacetic acid `(K_a =5 xx 10 ^(-2) ) ` that also contains 0.1 M sodium dichloroacetae. Neglect hydrolysis of sodium salt. If `[H^(+) ]= yxx 10 ^(-2) ` then what is the value of y ?

Text Solution

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The correct Answer is:
5

` pH= pKa+log ""(S)/(A) =2- log 5 +log ""(0.1)/(0.1) `
` pH =2 -log 5 rArr [H^(+)] =5 xx 10 ^(-2) `
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