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(a) A student was supplied with colourless liquid suspected to be water.
(i) Describe two chemical test that could have been used to show that liquid was water.
(ii) How could it have been shown that liquid was pure water?
(b) The flow chart below shows the various stages of water treatment. Study it and answer the questions that follow.
(i) Which substances are likely to be removed in filtration unit I?
(ii) What is the name of process Y
(iii) What is the purpose of:
(I) Process Y
(II) Addition of sodium hypochlorite
(c) It was confirmed that magnesium sulphate was present in the tap water
(i) What type of hardness was present in the water?
(ii) Explain how the hardness can be removed.