JAMB - Chemistry (1994 - No. 30)
Which of these solutions will give a white precipitate with a solution of barium chloride acidified with hydrochloric acid?
Sodium trioxocarbonate (IV)
Sodium tetraoxosulphate (IV)
Sodium trioxosulphate (IV)
Sodium sulphide
Forklaring
The characteristic test for any soluble tetraoxosulphate(VI) is the formation of white precipitate (barium sulphate) when a solution of barium chloride, acidified with dilute HCl, or when a solution of barium nitrate, acidified with dilute nitric acid is reacted with it.