Question

Calcium hypochlorite (ca(ocl)2, mw = 142.983 g/mol) is often used as the source of the hypochlorite ion (ocl–, mw = 51.452 g/mol) in solutions used for water treatment. a student must prepare 50.0 ml of a 40.0 ppm ocl– solution from solid ca(ocl)2, which has a purity of 95.0%.

Answer 1

The mass of solid $\rm Ca(OCl)_2$ needed is 2.64 mg.

What is Calcium hypochlorite?

Calcium hypochlorite is an inorganic compound whose chemical formula is  $\rm Ca(OCl)_2$.

For this calculation, we will use stoichiometry

$\rm 40 mg/L \times \dfrac{1l}{1000 mL} \times 50 mL\dfrac{1g}{1000 mg} \times \dfrac{1\;mol\;OCL^-}{51.452 g} \times \dfrac{1 mol Ca(OCl)_2}{2 mol OCl^-} \times 142.983 g Ca(OCl)_2/mol \times 0.95 \\\\= 2.64 \times 10^-^3 or \;2.64\;mg.$

Thus, the mass of solid $\rm Ca(OCl)_2$ needed is 2.64 mg.

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