Question

in three test tube a,b and c three different liquid namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap solution is added to each test tube and the contents are shaken. In which test tube will the length of the foam be longest? justify your answer

Answer 1

The length of the foam will be longest in the test tube A because the soap added in water will easily form foam with distilled water.

In the underground water and the water with pinch of calcium sulphate, the calcium (Ca2+) and magnesium ( Mg2+) ions reacts with sodium salts present in soap, resulting in formation of lather which in turn hinders the foam production.

Answer 2

In test tube A the length of the froth be longest on the grounds that cleanser structure froth effectively with refined water.

Underground water and calcium sulfate containing water when respond with structure don't shape froth.

It frames rubbish because of calcium and magnesium salts.

This is the reason it is so hard to shape foam in hard water, the calcium and magnesium particles respond with the unsaturated fats, rather to frame these insoluble lime cleansers.