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Determine the quantity of bleaching powder required for a rural water supply scheme so as to chlorinate 20000 litre of water, whose chorine demand is 2 mg/l. Assume the bleaching powder has 50 % available chlorine.

Determine the quantity of bleaching powder required for a rural water supply scheme so as to chlorinate 20000 litre of water, whose chorine demand is 2 mg/l. Assume the bleaching powder has 50 % available chlorine. Correct Answer 80 gram

Concept:

Chlorine required = amount of water(in litre) × Chlorine demand (mg/l)

Calculation:

Amount of water to chlorinate = 20000 litre

Chlorine demand = 2 mg/l

Bleaching powder has available chlorine = 50%, which signifies that 1 gm of bleaching powder has

0.5 gm of available chlorine

So total chlorine required = 20000 × 2 = 40000 mg = 40 gm

Total Bleaching powder required = 40 × (1/0.5) = 40 × 2 = 80 gm

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