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Notes ACIDS, BASES AND SALTS

Acids, BASES and SaltsSCIENCE AND TECHNOLOGY 154 NotesMODULE - 2 Matter in our Surroundings8 ACIDS, BASES AND SALTSFrom generations, our parents have been using tamarind or lemon juice to give shinylook to the copper vessels. Our mothers never store pickles in metal salt and sugar has often been used as an effective preservative. How didour ancestors know that tamarind, lemon, vinegar, sugar etc. works effectively? Thiswas common collective wisdom which was passed from generation to days, bleaching powder, baking soda etc. are commonly used in our must have used various cleaners to open drains and pipes and window panecleaners for sparkling glass. How do these chemicals work? In this lesson we willtry to find answers to these questions.

(a) Milk of magnesia (b) gastric juice in humans (c) soft drinks (d) lime water (e) vinegar (f) soap 2. What will happen if you add a drop of the following on a cut unripe apple, curd, causting soda solution and soap soluton. (i) phenolphthalein (ii) litmus 8.2 PROPERTIES OF ACIDS AND BASES Each substance shows some typical or characteristics ...

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