- - Test for sulphate/sulphuric acid: Dilute solution of sulphuric acid/aqueous solution of sulphates gives white precipitate (barium sulphate) with barium chloride solution. It can also be detected using lead acetate solution. Here a white precipitate of lead sulphate is obtained. BaCl + H SO BaSO Barium sulphate (White precipita ↓ te) Lead sulphat + 2HCl (CH COO) Pb + H SO PbSO ↓ e (White precipitate) + 2CH COOH Structure of oxoacids of sulphur: Sulphur forms many oxoacids.
The most important one is sulphuric acid. Some acids like sulphurous and dithionic acids are known in the form of their salts only since the free acids are unstable and cannot be isolated. Various oxo acids of sulphur with their structures are given below Name Molecular Formula Structure Sulphurous acid H SO