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A buffer solution of pH value 4 is to be...

A buffer solution of `pH` value `4` is to be prepared, using `CH_(3)COOH` and `CH_(3)COONa`.How much amount of sodium acetate is to be added to `1.0L` of `M//10` acetic acid? `(K_(a) = 2.0 xx 10^(-5))`

Text Solution

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For an acidic buffer containing acetic acid , `CH_(3)COOH ` and sodium acetate , `CH_(3)COONa`, we have :
`[H^(+)] = (K_(a)["acid"])/(["salt"]) ` [Use this rather than : `pH = pK_(a) + log_(10) .(["salt"])/(["acid"]) `
`[CH_(3)COOH] = 0.1 M`,
`[H^(+)] = 10^(-4) " M and let "[CH_(3)COONa] = x M`
`rArr [H^(+)] = 10^(-4) = (2 xx 10^(-5)xx 0.1)/x `
`rArr x = 0.02` moles i.e. `0.02` moles of `CH_(3) COONa` is required .
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