AQA GCSE Chemistry 3.2

Scale, calcium carbonate

Scum, calcium stearate

Scale, calcium carbonate

Scum, calcium stearate

Permanent hard water

Temporary hard water

Potassium K+

Sodium Na+

Cadmium Cd2+

Iron Fe3+

Passing water through a sand filter for clear water

Passing water through metal meshes to remove large objects

Chlorination of water to kill bacteria

Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water

Passing water through a sand filter for clear water

Passing water through metal meshes to remove large objects

Chlorination of water to kill bacteria

Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water

Passing water through a sand filter for clear water

Passing water through metal meshes to remove large objects

Chlorination of water to kill bacteria

Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water

Passing water through a sand filter for clear water

Passing water through metal meshes to remove large objects

Chlorination of water to kill bacteria

Adding aluminium sulphate and lime to encourage flocculation of suspended particles in the water

Fluorine

Hydrogen sulphide

Ozone

Methane

Sulphate, SO42-

Fluoride, F-

Nitrate, NO3-

Potassium, K+