What is the degree of hardness in ppm of a sample containing \(19\text{ mg}\) of \(MgCl_2\) molecular weight \(=95\) in \(2\text{ kg}\) water sample? Express it in terms of equivalents of \(CaCO_3\).
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Hardness as \(CaCO_3\) equivalent \(=\text{mass of salt}\times\frac{50}{\text{equivalent weight of salt}}\).