Determine the volume of the solution required to prepare 0.22 mol/dm³.

To determine the volume of the solution required to prepare 0.22 mol/dm³, we need to know the amount of solute (in moles) that we want to dissolve in the solution and the concentration of the solution.

In this case, the concentration of the solution is 0.22 mol/dm³. Let's assume we want to prepare 1 liter of this solution.

To calculate the volume of the solution required, we can use the formula:

Volume (in liters) = Amount of solute (in moles) / Concentration (in mol/dm³)

Since we want to prepare 1 liter of the solution and the concentration is 0.22 mol/dm³, we can plug these values into the formula:

Volume = 1 / 0.22 = 4.55 liters

Therefore, the volume of the solution required to prepare 0.22 mol/dm³ is 4.55 liters.

The question lacks necessary information to determine the volume of the solution required. The provided concentration (0.22 mol/dm³) is insufficient to calculate the volume without knowing the amount of solute (moles) or the total volume of the solution.