Testing for ions and gases 100% SOLUTION

Testing for ions and gases 100% SOLUTION Aluminium (Al3+) - Add Sodium Hydroxide then add Excess Sodium Hydroxide - ANSWER White precipitate forms, then dissolves in excess Sodium Hydroxide Aluminium (Al3+) - Addition of Ammonia solution Then excess Ammonia - ANSWER White precipitate, insouble in excess ammonium (NH4+) - ANSWER Heat gently. Gas given off will turn red litmus paper blue Calcium (Ca2+)-Addition of Sodium Hydroxide - ANSWER White precipitate formed. Insoluble in excess Calcium (Ca2+)-Addition of Ammonia solution - ANSWER No precipitate or very slight white precipitate Copper (Cu2+)-Addition of Sodium Hydroxide - ANSWER Light blue precipitate, insoluble in excess Copper (Cu2+)-Addition of Ammonia solution - ANSWER Light blue precipitate, soluble in excess giving a dark blue solution Iron (II) (Fe2+) - addition of Sodium Hydroxide - ANSWER green precipitate formed. Insoluble in excess Iron (III) (Fe3+) - addition of Sodium Hydroxide - ANSWER reddish-brown precipitate formed. Insoluble in excess Zinc (Zn2+) - addition of Sodium Hydroxide - ANSWER white precipitae formed. Soluble in excess (colourless solution) Zinc (Zn2+) - addition of Ammonia solution - ANSWER .white precipitae formed. Soluble in excess (colourless solution)