1.

laboratory of a school, the sample of hard water is not avaitable "to study thech saltcomparative cleaning capacity of a sample of soap in soft and hard waterfrom the laboratory can be added to tap water to make it hard? Inhow is cleaning capacity of soap compared?". Whi

Answer»

Salt: Sulphate, Chloride or hydrogen Carbonate of Calcium or Magnesium (any one)

By adding equal amount of soap to water taken in two test tubes, shakingvigorously and comparing the length of lather or foam formed in each testtube.



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