1.

How does a soap behave in the presence of Ca^(2+) and Mg^(2+) ions in solution ?

Answer»

Solution :Soap is sodium or POTASSIUM salt of fatty acid which CONTAINS a large chain of CARBON atoms. Soap interacts with the `Ca^(2+) and Mg^(2+)` ions of produce insoluble salts of calcium or magnesium which separat from the solution as SCUM :
` underset("soap")2Na(Ft) + Ca^(2+) to underset("scum") Ca(Ft)_(2) darr + 2Na^(+)`


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