# What reagent can be used to test for the presence of sulfate ions ?

Aug 31, 2015

Barium chloride solution can be used.

#### Explanation:

Barium sulfate is insoluble so forms a precipitate:

CuSO_(4(aq))+BaCl_(2(aq))rarrBaSO_(4(s))+CuCl_(2(aq)

Omitting the spectator ions:

$B {a}_{\left(a q\right)}^{2 +} + S {O}_{4 \left(a q\right)}^{2 -} \rightarrow B a S {O}_{4 \left(s\right)}$