Question

Why is the concentration of 1.34gvCuCl2 in a volumetric flask with approx. 100mL of water has a concentration of 0.050M?

Answer 1

Answer:

Concentration will be 0.1 M and not 0.050M

Explanation:

This explains why the molarity is not 0.050 M but 0.1 M

Molarity is the concentration of a solution in moles per liter.

Therefore,

Molarity = moles ÷ Volume

In this case,

We have 1.34 g of CuCl₂ and a volume of 100 mL

To get the molarity we need to find the number of moles in 1.34 CuCl₂

Number of moles = Mass÷ molar mass

Molar mass of CuCl₂ = 134.45 g/mol

Therefore,

Moles of CuCl₂ = 1.34 g ÷ 134.45 g/mol

                         = 0.009965 moles

                         = 0.01 moles

Then we can calculate the molarity;

Molarity = Number of moles ÷ Volume

Volume of the solution is 100 mL or 0.1 L

Molarity = 0.01 moles ÷ 0.1 L

            = 0.1 M

Therefore, the concentration of 1.34 g CuCl₂ in a volume of 100 mL is 0.1 M and not 0.050M.