Question

A student was asked to take 10 ml of rainwater in test tube a and 1g of calcium sulphate added to 10 ml of distilled water in test tube b he added soap solution in both the test tube after shaking both the test tube equal number of time in which case more lather will be formed and why

Answer 1

The student observes that in the test tube where he mixed CaSO₄ with water would give less foam as compared to the other test tube because the water contains salts of Ca which make it hard and normal soaps can't remove it.

In other test-tube there would be much larger foam, as there are no salts of Ca and Na and it's soft water.

Answer 2

HIII.....

GOOD MORNING:-)

HERE IS YOUR ANSWER:--------

THE STUDENT WILL OBSERVE THAT IN THE TEST TUBE WHERE HE MIXED CaSO4 WITH WATER WILL GIVE LESS FOAM AS COMPARED TO THE OTHER TEST TUBES BECAUSE THE WATER CONTAINS SALT OF Ca WHICH MAKES IT HARD AND NORMAL SOAPS CAN'T REMOVE IT.

HOPE THIS HELPS YOU.....