Question

When 45.0g CaCl2 is dissolved to make a 750.mL solution what is the resulting molarity. Show work

Answer 1

Molarity is the method of expressing concentration of solution. Mathematically, it is expressed as
Molarity = $\frac{\test{weight of solute (g)}}{\text{molecular weight X Volume of solution(l)}}$

In present case, Molecular weight of CaCl2 = 110.98 g
volume of solution = 750 ml = 0.750 l
weight of solute (CaCl2) = 45 g

∴Molarity = $\frac{\test{45}}{\text{110.98 X 0.750}}$
                = 0.54 M

Concentration of solution is 0.54 M