1.

In a mixture of weak acid and its salt, the ratio of concentration of acid to salt is increased ten-fold. The pH of the solution

Answer»

Decreases by one
Increases by one-tenth
Increases by one
Increases ten-fold

SOLUTION :It is buffer solution so,
`pH = pK_(a) + log.("Salt")/("ACID")`
`pH = pK_(a) - log.("Salt")/("Acid")`(Given `(["Acid"])/(["Salt"]) = 10 :1`)
`pH = pK_(a) - log 10`
`pH = pK_(a) = - 1`.


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