Ammonia, NH 3, is an alkaline gas and so turns damp red litmus paper blue. Ammonium ions (NH 4 +) – found in ammonium compounds such as ammonium chloride, ammonium nitrate and ammonium sulfate ...

The solutions will become cloudy and change color due to the precipitation of metal hydroxides. Add 15M NH4OH with stirring to the same beaker or test tube. The precipitates will dissolve and darkly ...