(a) Complete the following equations : (i) nCH_(2) = CH_(2) rightarrow……….. (ii) CH_(3)COOH - NaHCO_(3)rightarrow …….+……+……. (b) What is the cause of hardness of water? Why soap does not form lather with hard water? Mention the disadvantage of cleaning clothes with soap in hard water?

(a) Complete the following equations : (i) nCH_(2) = CH_(2) rightarro

1.	(a) Complete the following equations : (i) nCH_(2) = CH_(2) rightarrow……….. (ii) CH_(3)COOH - NaHCO_(3)rightarrow …….+……+……. (b) What is the cause of hardness of water? Why soap does not form lather with hard water? Mention the disadvantage of cleaning clothes with soap in hard water?
Answer» Solution :(a) (i) `nCH_(2)=CH_(2)rightarrow(-CH_(2)-CH_(2))_(n)` (ii) `CH_(3)-COOH+NaHCO_(3)rightarrowCH_(3)H_(2)O+CO_(2)-COONA^(+)` (b) Presence of `Ca^(2+)` IONS and `Mg^(2+)` ions. Formation of INSOLUBLE calcium and magnesium salts with soap. Soap gets WASTED simply as it does not FORM lather with soap.