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(i) You have three unlabelled test-tubes...

(i) You have three unlabelled test-tubes containing ethanol, ethanoic acid and soap solution. Explain the method you would use to identify the compounds in different test tubes by chemical tests using litmus paper and sodium metal.
(ii) Give the reason of formation of scum when soaps are used with hard water.

Text Solution

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(i)

(ii) Hard water contains calcium ions or magnesium ions or both These ions on reacting with soap solution form insoluble substance called scum.
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