A sample of hard water is found to contain 40 mg of Ca2+ ions per litre. The amount of
washing soda ( Na2CO3) required to soften five litres of the sample would be
a) 1.06 grams b) 5.3 grams c) 53 mg d) 530 mg
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Answer:
Answer is 530g .
5 x 40 = 200
200 mg of Ca ^2+
= 106 / 40 x 200 x 10^-3 = 530g
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