Question

what do you mean by w/w solution
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Answer 1

The concentration of a solution indicates the relative amount of solute and solvent present. They vary only in the units that are used but always express the amount of solute in a given volume of solution. The label on the right states that the solution contains 0.3% (w/w) PCMX, where (w/w) is weight per weight.

Answer 2

Weight per Weight

weight concentration of a solution is expressed as % w/w. Like before, this stands for Weight per Weight. In this case, the volume of each chemical is disregarded and only the weight is used.