Water - Solubility - Ions
Negative Ions - Sulfate.
The Barium Chloride Test
for Sulfate (SO42-) Ions.
Any soluble sulfate will give a white precipitate of barium sulfate.
+ zinc sulfatezinc chloride + barium
BaCl2(aq) + ZnSO4(aq) ZnCl2(aq) + BaSO4(s)
The ionic equation is Ba2+(aq) + SO42-(aq) BaSO4(s)
The test is made in the presence of
dilute hydrochloric acid to remove any carbonate or sulfite ions
which may be present. These ions will
also produce a precipitate which would confuse the results.
Barium sulfate is sometimes used as a barium meal.
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