Which of the following salts will give highest `pH` in water?

Options

A. `KCl`
B. `Nacl`
C. `Na_(2)CO_(3)`
D. `CuSO_(4)`

Answer

C

Explanation

`Na_(2)CO_(3)` is a salt of strong base `(NaOH)` and weak acid `(H_(2)CO_(3))`. On hydrolysis this salt will produce strongly basic solution. i.e., `pH` will be highest `(pHgt7)` for this solution. Others are combination of
`KCl=` strong acid `+` Strong base `rarr` neutral solution `(pH=7)`
`NaCl=` Strong aicd `+` Strong base `rarr` neutral solution `(pH=7)`
`CuSO_(4)=` Strong acid `+` weak base `rarr` Acidic solution `(pHlt7)`