100 liters of water for softening needed 15.9 grams of Na_2CO_3. What was the hardness of water?

1 Answer
il maestro
Mar 22, 2018

15 °f

Explanation:

15.9 gr of Na_2CO_3 are 0.15 moles, therefore the 100 liters softened water contain 0.15 moles of CaCO_3, i.e. 1.5 millimolar Calcium ion, corresponding to 15 french degrees (moderately hard water)

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