**We´re asked to ****convert the concentration of a solution**** from 0.5% (w/v) to mg/mL.**

**Remember that a ****concentration of % w/v ****means the ****weight of the solute per volume of solution****, multiplied by a 100:**

**$\overline{){\mathbf{\%}}{\mathbf{}}\raisebox{1ex}{$\mathbf{w}$}\!\left/ \!\raisebox{-1ex}{$\mathbf{v}$}\right.{\mathbf{=}}\frac{\mathbf{Grams}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solute}}{\mathbf{Liters}\mathbf{}\mathbf{of}\mathbf{}\mathbf{solution}}{\mathbf{\times}}{\mathbf{100}}}$**

If a solution is 0.5% (w/v), how many mg/ml is that?