[alt-photo] Re: Math mystery

Luciano Teghillo luciano at lucianoteghillo.com
Thu Feb 28 20:19:14 GMT 2013


Hi Jacques,

I struggled with the same issue a while ago and this is what I found out.

As an example, if you have a liter of 24% formalin solution e need to make
it a 10% solution:


initial volume = 1 liter
final volume = x
Initial concentration = 24%
Final concentration = 10%

V1C1 = V2C2 

OR

1*24/100 = x*10/100

x= 2.4 L

So you need to add 2.4 - 1 = 1.4 liter to make a 10% solution.

Please correct me if I am wrong.

Cheers,
Luciano





-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Jacques Kevers
Sent: Thursday, February 28, 2013 8:30 PM
To: The alternative photographic processes mailing list
Subject: [alt-photo] Math mystery

Hi,
I have a problem to understand the math behind this (related to making a
hardening solution with formalin):
"Add 25ml of formalin to 1,000ml of distilled water which makes a 3%
formalin hardening solution."
I mean, even if the formalin is 100% pure, 25 ml on 1000 is only 2.5% ,
right?
So, when using a 37% solution of formalin, I would think that you have to
use around 80ml of the formalin solution...
What am I missing?
Thanks,
Jacques
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