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[APD] Re: ppm solutions
>1) you put 100g of NO3 in 100mL of water. This is INCORRECT.
>2) you put 100g of NO3 in as much water as needed to yield 100mL of
>solution. THIS is CORRECT.
Yes, I agree with you on this solution (pun!). However, I think it means
that the measuring cup would need to be filled with the chemical solution.
If most people are like me (and maybe that's stretching things a bit) they
use their kitchen glass Pyrex measuring cup. So I would prefer to just add
the compound to the water so that only tap water ever touches the cup.
Otherwise, every chemical I mix would need to be poured into the cup to
measure the correct final volume.
Does that make sense? Maybe I should just go out and buy another measuring
Anyway I think that people would rather mix a chemical into a given amount
of water than to mix it with less water and then have to bring the volume up
to the required amount, as this would require re-measuring the mixed water.
If the densities at the Merck site are the ones I need then its no problem
changing the calculation.
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