A salt, S , is dissolved in water and three tests are carried out on the solution formed. | | test | result | | :--- | :--- | :--- | | 1 | aqueous sodium hydroxide is added | green precipitate forms, insoluble in excess sodium hydroxide | | 3 | aqueous barium nitrate is added to the solution from test 2 | white precipitate forms | What is the identity of $S$ ?
Explanation
The green precipitate formed with aqueous sodium hydroxide indicates the presence of copper(II) ions, and the white precipitate formed with aqueous barium nitrate indicates the presence of sulfate ions, suggesting that the salt S is copper(II) sulfate.
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