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Concentration Terms - An Introduction (w/w etc)

Calculate the...

Question

Calculate the weight of $C a O$ required to remove the hardness of 1000000 litre of water containing 1.62 g of $C a C O_{3}$ per litre.

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Solution

Mass of $C a (H C O_{3})_{2}$ in the water is:

$= 1.62 \times 1000000$

$= 1620000 g = 1620 k g$
Reaction involved in the removal of hardness may be given as:

$C a (H C O_{3})_{2} 162 k g + C a O 56 k g \to 2 C a C O_{3} + H_{2} O$

$∵$ 162 kg $C a (H C O_{3})$ , require $56 k g C a O$
$∴$ 1620 kg $C a (H C O_{3})_{2}$ will require $560 k g C a O .$

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