Question

A 0.1090 g sample of copper metal is dissolved in 60. ml of concentrated hno3 to form cu2+ ions and then water is added to make a total volume of 203.1 ml. (calculate the molarity of cu2+.)

Answer 1

Mass of Copper metal dissolved = 0.1090 g

Moles of Copper dissolved = $0.1090 g * \frac{1 mol}{63.55 g} = 0.00172 mol Cu$

Total volume of the solution = 203.1 mL $* \frac{1 L}{1000 mL} = 0.2031 L$

Calculating the molarity of copper ions in the solution:

Molarity of a solution = $\frac{Moles of solute}{Volume of solution (L)}$

= $\frac{0.00172 mol Cu^{2+}}{0.2031 L}$

=0.00845 mol/L

Therefore the molarity of copper ions is 0.00845 mol/L