Question

The crystal of copper sulphate contains five water molecules and the formula is written as Cuso2.5H2O. Calculate he molarity rate of a solution prepared by dissolving 1.25 g of this compound is enough water to give 50 ml of s0lution.

Answer 1

The molarity of the solution is 0.156 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n = moles of solute $(CuSO_4.5H_2O)$

$V_s$ = volume of solution in ml = 50 ml

moles of $CuSO_4.5H_2O$ = $\frac{\text {given mass}}{\text {Molar mass}}=\frac{1.25g}{159.6g/mol}=0.0078mol$

Now put all the given values in the formula of molality, we get

$Molarity=\frac{0.0078\times 1000}{50}$

$Molarity=0.156M$

Therefore, the molarity of the solution is 0.156 M

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