Solutions
Just a little clarification...
Solution concentration is measured in the units per volume of solution NOT water (i.e. moles/litre solution or g/litre solution or g/100cm3 solution)
This is (I imagine) purely down to the convenience factor of solution preparation. Which usually goes as follows:
1. Measure out xg of a solute.
2. Dissolve in a quantity of water in a volumetric flask (100cm2, 250cm3, 1dm3 etc) .
3. Make up to the mark with distilled water.
The end result is units per litre of solution.
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