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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