A sample of hard water is taken in two containers A and B. To container 'A ', a detergentis added and soap is added to container 'B'. The water in 'A' is moreefficient in cleaning than the water in 'B' . Justify.

A sample of hard water is taken in two containers A and B. To containe

1.	A sample of hard water is taken in two containers A and B. To container 'A ', a detergentis added and soap is added to container 'B'. The water in 'A' is moreefficient in cleaning than the water in 'B' . Justify.
Answer» Solution :Effectiveness of SOAP is reduced when used in hard water. Hardness in water is caused by the presence of mineral salts mostly of CA and Mg. The mineral salt REACTS with soap to form an insoluble precipitate known as scum. Lather formation is reduced. Detergent forms solublecompounds withcalcium andmagnesium and hence does not form scum with hard water. Due to this reason, water in 'A' is more efficient in CLEANING than water in 'B'.