Concentration can be expressed in terms of %w/w which refers to the amount of solute in the total mass of the solution (solute + solvent). This is expressed as:
For KCl solution
Solute = 33.6 g KCl
Solute + solvent = 33.6 g KCl + 192 g water = 225.6 g
The safest method for diluting
concentrated sulfuric acid with water is to add acid to water. This way, when
spill occurs, the acid is already diluted and less harmful than adding water to
acid.