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Determine the pH of a buffer solution co...

Determine the pH of a buffer solution consisting of 0.01(M) `CH_(3)COOH and 0.03(M)" "CH_(3)COONa.` Given: `K_(a)(CH_(3)COOH)=1.8xx10^(-5)`.

Text Solution

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`pK_(a)` of `CH_(3)COOH=-log_(10)K_(a)`
`=-log_(10)(1.8xx10^(-5))=4.74`
For the buffer solution of `(CH_(3)COOH+CH_(3)COONa),pH=pK_(a)+"log"([CH_(3)COONa])/([CH_(3)COOH])`
Given: `[CH_(3)COOH]=0.01(M),[CH_(3)COONa]=0.03(M)`
`therefore`pH of the buffer solution`=4.74+"log"(0.03)/(0.01)=5.21`
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