Re: [APD] Re: ppm solutions

[revance at indiana_edu]

You don't have to remeasure the mixed water or anything complicated like 
that... find a container that you will use for your solution and nothing else. 
Add 100mL of water to the container. Mark the level of the water on the side 
of the container (make sure to be accurate). Empty the container and add 100g 
of NO3, then just fill the container up to the line with water. 

This is easier and much more accurate than trying to measure out everything 
separately or adding 100g of NO3 to 100mL of water.

I know this is a pretty simple solution, but it really seems to be the most 
accurate and convenient.


Quoting Steven Pituch <spituch at ev1_net>:

> Tony said:
> >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
> cup.
> 
> 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.
> 
> Steve Pituch
> 
> 
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> 
> 


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