Increase the surface area of the solute with a mortar and pestle. Next measure out the mass of the solute. Add water and increase the temperature and use a magnetic stirrer. Do not fill to the necesary volume. Do not use a graduated cylinder instead use a volumetric flask. Pour solution into the flask. First measure the mass of the flask. rinse the beaker in which the solution was in. add more water to flask and fill to the needed volume. Then find the mass of solution.