Question

A chemist prepares a solution of barium chloride by measuring out of barium chloride into a volumetric flask and filling the flask to the mark with water.Calculate the concentration in μmol L of the chemist's barium chloride solution. Round your answer to 2 significant digits.

Answer 1

Answer:

30 μmol/L

Explanation:

A chemist prepares a solution of barium chloride by measuring out 8.9 μmol of barium chloride into a 300mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in μmol L of the chemist's barium chloride solution. Round your answer to 2 significant digits.

The chemist has 8.9 μmol of solute (barium chloride) and he adds water until the mark of 300 mL in the container, which is the volume of the solution. We will need the conversion factor 1 L = 1000 mL. The concentration of barium chloride in μmol/L is:

$\frac{8.9\mu mol}{300mL} .\frac{1000mL}{1L} =30\mu mol/L$