Which has the highest `pH`?

Options

A. `CH_(3)COOK`
B. `Na_(2)CO_(3)`
C. `NH_(4)Cl`
D. `NaNO_(3)`

Answer

B

Explanation

`pH="log"(1)/([H^(+)])`
pH is inversely proportional to hydrogen oon concentration. As the concentration of `H^(+)` decreases. pH increases chloride `(NH_(4)Cl)` is a salt of weak base and strong acid. So, its aqueous solution will be acidic as `NH_(4)Cl+H_(2)O to NH_(4)OH+HCl`
So, pH of NHCl is less than 7
Sodium nitrate `(NaNO_(3))` is the salt of strong acid and strong base. So it is aqueous solution is neutral as `NaNO_(3)+H_(2)O to underset("Strong acid")(NaOH)+underset("Strong acid")(HNO_(3))`
So, pH of `NaNO_(3)` is 7.
Potassium acetate `(CH_(3)COOK)` is a salt of strong base and weak acid. Its aqueous solution will be basic and H value will be `gt7~~8.8`
`CH_(3)COOK+H_(2)O to underset("Strong acid")(NaOH)+underset("Strong base")(HNO_(3))` sodiu carbonate is a salt of strong base and weak acid, its aqueous solution is also basic and its pH value will be more than 10.
`Na_(2)CO+H_(2)O to underset("Strong acid")(NaOH)+underset("Weak base")(HNO_(3))`