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Hardness of Water and Treatment

Clark's metho...

Question

Clark's method of water softening uses:

A

Na₆P₆O₁₈

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B

Ion exchange resin

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C

Na₂CO₃

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D

Ca(OH)₂

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Solution

The correct option is D
Ca(OH)₂

In Clark's method of water softening, hard water is treated with Ca(OH)₂(Slaked lime).

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Q. Discuss the principle and method of softening of hard water by synthetic ion-exchange resins.

Q. Zeolites are ion-exchange resins used for softening of water. Superior ion-exchangers were made just before and Second World War. These consisted of:

Q. Match the column I with column II and mark the appropriate choice .

	Column I		Column II
A	Clark's method	i	$N a_{6} P_{6} O_{18}$
B	Calgon's method	ii	$N a A l S i O_{4}$
C	Ion-exchange method	iii	$R S O_{3} H$
D	Synthetic resins method	iv	$C a (O H)_{2}$

Q. The molecular formula of a commercial resin used for exchanging ions in water softening is

C_{8} H_{7} S O_{3}

(Mol. wt. 206). Water would be the maximum uptake of

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molecular weight

206)

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C a^{2 +}

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