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Acids, Bases and Salts — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceAcids, Bases and Salts3 Marks
Question
Explain why
(a) an antacid tablet is taken when you suffer from acidity?
(b) calamine solution is applied on the skin, when an ant bites?
(c) factory waste is neutralised before disposing it into the water bodies?
✓

Answer

(a) We take an antacid tablet such as milk of magnesia to neutralise the excessive acid released in stomach during acidity.
(b) When an ant bites, it injects the formic acid into the skin. The effect of acid can be neutralised by applying calamine solution that contains zinc carbonate which is a base.
(c) The factory wastes contain acids if they are allowed to flow into the water bodies without neutralising it, the acid can kill fishes and other organisms. The factory wastes are thus neutralised by adding basic substances

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