1. If the problem asks for percent concentration by mass, what equation you are going to use? ______________
2. What equation are you going to use, if the problem asks for mass solute?____________________
3. What equation are you going to use, if the problem asks for the mass solvent? ____ Percent by volume are for solutions that involve a liquid solute and solvent, and expresses concentration by volume of its components. It expresses the concentration of a liquid solution as percentage of the volume of solute to the volume of the solution (g/100 mL). Most rubbing alcohol products sold in this pandemic have a concentration of 70%, which could be isopropyl or ethyl alcohol. This means that 70% is alcohol and the other 30% is water (by volume of solute and solvent). Percent by volume could be computed as:
