1.

For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be (K_(a) = 10^(-5))

Answer»

`1:10`
`10:1`
`100:1`
`1:100`

SOLUTION :`K_(a) = 10^(-5) , PH = 6`
`pH = -LOG K_(a) + log .(["SALT"])/(["Acid"]), 6 = -log 10^(-5) + log .(["Salt"])/(["Acid"])`
`6 = 5 log 10 + log .(["Salt"])/(["Acid"]), 6 = 5 + log .(["Salt"])/(["Acid"])`
`log .(["Salt"])/(["Acid"]) = 6 =5 = 1, (["Salt"])/(["Acid"]) = (10)/(1)`.


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