How to make a 2 percent solution with 3 gallons of water? - Answers

For liquids (2% volume/volume): Simply add 2% of the volume to the water. This comes out to 0.06 gallons or 0.96 cups. Note: It is probably more accurate to add 0.06 gallons of whatever to 2.94 gallons of water but honestly errors in measurement will most likely be greater than this small difference. For solids (2% mass/volume): 3 gallons of water are approximately 11.356 liters which is 11356 ml. Since water has a density of roughly 1 g/ml this is equivalent to 11356 g. To make a 2% solution, you would need to add 2% of this weight of whatever you are dissolving which comes out to 0.227 g.