Discussion
Softening 50 000 litres of that water requires soda ash amounting to
Answer: C
One hundred and six milligrams per litre on fifty thousand litres is 5.3 million milligrams, that is 5.3 kilograms of soda ash. The lime requirement over the same volume, at 148 milligrams per litre, would be 7.4 kilograms.
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