Calculating molarity using solute moles

Question

A chemist prepares a solution of mercury(I) chloride Hg2Cl2 by measuring out 0.00011μmol of mercury(I) chloride into a 50.mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in mol/L of the chemist's mercury(I) chloride solution. Be sure your answer has the correct number of significant digits.

Answer 1

Solution

Molarity (M) = mol/volume

mol = 0.00011 micromol = 1.1 x 10^-10 mol

volume = 50 mL = 0.05 L

Molarity (M) = 1.1 x 10^-10 mol / 0.05 L = 2.20 x 10^-9 mol/L

Concentration = Molarity = 2.20 x 10^-9 mol/L