Descriptive inorganic chemistry UE Past Papers Questions.

An amphoteric substance is soluble in water, but insoluble in either acidic or basic solutions.

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The titration between iodine gas ( solution with starch solution against thiosulphate solution, the colour changed from blue to colourless meaning that, iodine gas solution was reduced.

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Alkalinity is defined as a mesure of the buffering capacity of water to neutralize strong acid.

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Carbonate ion, silicate ion, sulphide ion, and thiosulphate ion are cation in group I cation which reacts with hydrochloric acid solution, form precipitates.

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Sulphate ion, phosphate ion, silicate ion, and borate ion are group II cation, do not react with hydrochloric acid, but form precipitate with barium ions in neutral medium.

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