In: Chemistry
how do you make a copper(II) sulfate solution with an assigned concentration between 0.04 M and 0.2 M
The molar mass of copper(II) sulfate is 159.61 g/mol.
To make the solution of 0.04 M concentration, we should have 0.04 moles of copper(II) sulfate in 1000 mL. As we know the molecular weight and number of moles, we can calculate the mass of copper(II) sulfate using following formula,
Mass of copper(II) sulfate in g = number of moles of copper(II) sulfate x molecular weight of copper(II) sulfate in g/mol
= 0.04 mol x 159.61 g/mol
= 6.38 g
Therefore, to make 0.04 M copper(II) sulfate solution, we should dissolve 6.38 g of copper(II) sulfate in 1000 mL.
For 0.2 M, we will need 0.2 moles of copper(II) sulfate in 1000 mL
Mass of copper(II) sulfate in g = number of moles of copper(II) sulfate x molecular weight of copper(II) sulfate in g/mol
= 0.2 x 159.61 g/mol
= 31.92 g
Therefore, to make 0.2 M copper(II) sulfate solution, we should dissolve 31.92 g of copper(II) sulfate in 1000 mL.