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

Options

A. Decreases by one
B. Increases by one-tenth
C. Increases by one
D. Increases ten-fold

Answer

A

Explanation

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