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What chemical compounds might be present in drinking water?

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Figure 15 Figure (a) is a photograph of a stone statue in front of a stone wall. The wall is a smooth light brown. Most of the statue is a light grey, but the face is almost black. There are pieces of metal around the arms and neck which look as if they attach the statue to the wall. Although the statue is still recognisably a person, much of the detail is missing due to weathering, especially around the hand, which might possibly be holding a crook.

Figure (b) is a photograph of a wall constructed from rectangular blocks, each of which is taller than it is wide. Most of the blocks are a dark brown colour, but one is badly weathered exposing a fresh surface that is almost completely white. Similarly, a narrow band along the join between some of the blocks is coloured white where some of the stone has fallen off.

 4 Cations in water