Probably a bad example as your original 40g/l is now a little less due to its absorbing atmospheric CO2.As a chemist/biochemist and later photo-chemist Molar solutions are used for specific purposes where accuracy is important, usually in experiments or testing often when titrating to determine a concentration of something else. Just makes calculations easier.
In practice the only molar solution I have is Sodium Hydroxide, I forget the strength offhand it came from a lab I ran I use it in print developers.
A molar solution is 1 mol (molecular weight measured in grams) per litre of solution. So, say sodium sulfate (molecular weight 142), a molar solution would be 142 g/l.
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