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Question

Give three distinct tests [apart from using an indicator] you would carry out with solution of HC1 to illustrate the typical properties of an acid.

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Solution

(a) Hydrochloric acid reacts with active metals to liberate a colourless and odourless gas which burns with a popping sound liberating hydrogen gas.
Mg+2HCl(dil.)MgCl2+H2

(b) Dilute hydrochloric acid reacts with metallic carbonate and bicarbonate to liberate a colourless and odourless gas with brisk effervescence which turns lime water milky i.e. CO2.
Na2CO3+2HCl(dil.)2NaCl+H2O+CO2
Confirmatory test :
Ca(OH)2+CO2CaCO3+H2O

(c) Dilute hydrochloric acid reacts with metallic sulphite and bisulphate to liberate a colourless gas having smell of burning Sulphur which turns acidified potassium dichromate paper from orange to green and potassium permanganate solution from purple to colourless.
Na2SO3+2HCl(dil.)2NaCl+H2O+SO2


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