Assertion (A): Hard water forms sticky precipitate with soap. Reason (R): Hard water contains calcium and magnesium ions Options: A . &nbsp Both A and R are true and R is a correct explanation of A B . &nbsp Both A and R are true but R is not a correct explanation of A C . &nbsp A is true but R is false D . &nbsp A is false but R is true

Assertion (A): Hard water forms sticky precipitate with soap. Reason (R): Hard

Discussion Forum : Chemistry In Everyday Life

Question -

Assertion (A): Hard water forms sticky precipitate with soap.
Reason (R): Hard water contains calcium and magnesium ions

Options:

A . Both A and R are true and R is a correct explanation of A

B . Both A and R are true but R is not a correct explanation of A

C . A is true but R is false

D . A is false but R is true

Answer: Option A
:
A

Hard water contains calcium and magnesium ions which forms insoluble precipitate with soap which are sticky in nature

$2 C_{17} H_{35} C O O N a      S o a p + C a C l_{2} \to + 2 N a C l + (C_{17} H_{35} C O O)_{2} C a      I s o l u a b l e p e r c i p i t a t e$

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