The steps required to prepare 200.0 ml of an aqueous solution of iron (iii) chloride, at a concentration of 1.25x10^-2 m. show the calculations determining what mass of solute to use in making this solution.

In order to prepare 200.0 mL of an aqueous solution of iron (III) chloride, at a concentration of 1.25 x 10⁻² M, you need to weight 0.4055 g of FeCl₃ and add to 200.0 mL of water.

Explanation:

Concentration: 1.25 x 10⁻² M

1,25 x 10⁻² mol FeCl₃ ___ 1000 mL

              x                   ___ 200.0 mL

         x = 2.5 x 10⁻³ mol FeCl₃

Mass of FeCl₃:

1 mol FeCl₃ 162.2 g

2.5 x 10⁻³ mol FeCl₃    y

                  y = 0.4055 g FeCl₃

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