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Proportions for a Chemical Solution

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Date: 6/24/96 at 13:47:3
From: William B. Fair
Subject: Formula for a Chemical Solution

I need some help in my basic math on mixing up percentage formulas.
For example, if I want a 10 percent solution of a particular chemical
that comes in powder form what would be the formula to solve this?

I've used amount desired times percent desired divided by percent on
hand for all of my liquid formulas, but now that a powdered chemical
has come into play I'm sure you just don't use an equal weight in
grams, say 10 grams in a 90 ml. beaker, and expect to get a 10 percent
solution.  Or is it that simple?

I hate to take your time up with something so basic, but other than to
the library and research this out I had hoped that the Internet could
help me out, and you were my first choice.

Thanks -
Bill
```

```
Date: 6/24/96 at 20:15:41
From: Doctor Anthony
Subject: Re: Formula for a Chemical Solution

I am not a chemist, but if you are mixing chemicals by weight, then
for a mixture containing 10% of a particular substance, in every 100
gms of the mixture, 10 gms will be of that chemical. If you are mixing
by volume, then clearly you would add 10 ml to 90 ml to get 100 ml of
the mixture. I note that you were confusing mass and volume when you
suggested 10 gms and putting this into a 90 ml beaker. I think you
should consult a chemist as to whether it is by mass or volume that
you are meant to be working.  If it is by volume you would doubtless
first dissolve the chemical at at a quoted mass for a given volume of
water, and then mix this liquid by volume with the other chemicals in
the ratio 1 : 9.

-Doctor Anthony,  The Math Forum
Check out our web site!  http://mathforum.org/dr.math/
```
Associated Topics:
High School Physics/Chemistry
Middle School Ratio and Proportion

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