1.

Find the pH of a buffer solution containing 0.20 mole per litre CH_(3)COONa and 0.15 mole per litre CH_(3)COOH, K_(a) for acetic acid is 1.8xx10^(-5)

Answer»

Solution :`K_(a)=1.8xx10^(-5)`
`pK_(a)=-log(1.8xx10^(-5))=4.7447`
`pH=pK_(a)+log""(["Salt"])/(["ACID"])`
`……….."... HENDERSON - Hasselbalch EQUATION"`
`=4.7447+log""(0.20)/(0.15)`
`pH=4.7447+log""(4)/(3)`
`=4.7447+0.6021-0.4771=4.8697`


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