Question:
The hardness of a water sample containing $10^{-3} \mathrm{M} \mathrm{MgSO}_{4}$ expressed as $\mathrm{CaCO}_{3}$ equivalents (in ppm) is
(molar mass of $\mathrm{MgSO}_{4}$ is $120.37 \mathrm{~g} / \mathrm{mol}$ )
Solution:
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