To make percent concentrations by mass for any solutions you need to make, always choose the first solution's percent. Let's say you want it to be 5% solute by mass........

5% solute solution = Mass 5 grams of the solute you wish to use placed in 95 ml of water (Remember 95 ml of water = 95 grams of water!).

10% solute solution = Mass 10 grams of the solute you wish to use placed in 90 ml of water.

etc...........

Remember to test many concentrations at regular intervals for best results! Note: Solutions over 50% solute by mass are difficult to make because the solute wants to precipitate out rather than dissolve!