Question

A chemist prepares a solution of copper (II) fluride (CuF₂) by measuring out 0.14 umol of copper(II) fluoride into a 200ml volumetric flask and filling the flask to the mark with water.

Calculate the concentration in mo/L of the chemist's copper (II) fluride solution. Be sure your answerhas the correct number of significant digits .

Answer 1

To calculate the concentration of solution we will use the formula of molarity (mol/L)

The formula of molarity is given below.

Molarity = Number of moles of solute / Volume of solution (in litres)

The given moles of copper(II) fluoride are first to moles from umol

1umol = 10^-6 mol

0.14umol = 1.4 x 10^-7 mol

Also convert mL to L

1L = 1000mL

200mL = 0.2 L

Now put the values in the formula of molarity

Molarity = 1.4 x 10^-7 / 0.2

            = 7 x 10^-7 mol /L

The concentration of given solution of CaF₂ is found to be 7 x 10^-7 mol /L