Question

An aqueous solution of ____ will produce a basic solution.

a. nh4clo4
b. kbr
c. nacl
d. na2co3
e. nahco3

Answer 1

Hydrolysis of
`NH_(4)ClO_(4)` is given as:

`NH_(4)ClO_(4)+H_(2)O\rightleftharpoons NH_(4)OH + HClO_(4)`

Here,
`NH_(4)OH` is a weak base and
`HClO_(4)` is a strong acid. Thus, solution is more acidic

Hydrolysis of
`KBr` is given as:

`KBr+H_(2)O\rightleftharpoons KOH  +   HBr`

Here,
`KOH` is a strong base and
`HBr` is a strong acid.Thus, solution is neutral.

Hydrolysis of
`NaCl` is given as:

`NaCl+H_(2)O\rightleftharpoons NaOH  + HCl`

Here,
`NaOH` is a strong base and
`HCl` is a strong acid.Thus, solution is neutral.

`Na_(2)CO_(3)+2H_(2)O\rightleftharpoons  2NaOH + H_(2)CO_(3)`

Here,
`NaOH` is a strong base and
`H_(2)CO_(3)` is a weak acid.Thus, solution is basic.

`NaHCO_(3)+H_(2)O\rightleftharpoons  NaOH + H_(2)CO_(3)`

Here,
`NaOH` is a strong base and
`H_(2)CO_(3)` is a weak acid.Thus, solution is basic.

Hence, an aqueous solution of
`NaHCO_(3)` and
`Na_(2)CO_(3)` will produce a basic solution.