Describe how to prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2 6H2O). Be sure to identify the labware shown above (flask and a scale), explain your reasoning, and show any calculations.

Question

Describe how to prepare 1 L of a 0.5 M solution of cobalt chloride hexahydrate (CoCl2   6H2O). Be sure to identify the labware shown above (flask and a scale), explain your reasoning, and show any calculations.

DrBob222 · Accepted Answer

M = mols/L
You want 1 L of 0.5M so you want 1 x 0.5 = 0.5 mols.
grams for 0.5 mol = mols x molar mass = ?

Weigh that many grams CoCl2.6H2O, add to a 1 L volumetric flask, add some water, swirl to dissolve the solute, add DI water to the mark on the flask, mix thoroughly, stopper.