Add 3M or 6M NH4OH drop wise while stirring with the stir rod to one beaker or test tube of each pair. The solutions will become cloudy and change color due to the precipitation of metal hydroxides.

Beaker A glass container with a pouring lip ... tapering glass or plastic tube used to eject or suck in a small amount of fluid. Test tube A thin, cylindrical container, usually made of glass.

Collect 50 cm 3 of hydrochloric acid in a small beaker. Connect the delivery tube and thistle funnel to the conical flask with the delivery tube in a basin of water. Have three gas jars/test tubes ...