One litre of a sample of hard water contains 1 mg of $CaCl_{2}$ and 1 mg of $MgCl_{2}$. Find the tot

Question

One litre of a sample of hard water contains 1 mg of $CaCl_{2}$ and 1 mg of $MgCl_{2}$. Find the total hardness in terms of parts of $CaCO_{3}$ per $10^{6}$ parts of water by weight.

Professor PC Thomas Classes · Answer

$1mg CaCl_{2} \approx 0.9mg CaCO_{3}$, $1mg MgCl_{2} \approx 1.05mg CaCO_{3}$. Total $\approx 2mg/L = 2 ppm$.