A solution concentration is:
Gr. of solute for 100 gr. of solution  weight %
Or:
ml. of liquid solute for 100 ml of solution  volume % (Ex.: H2O2, Alcohol)
The first is the more used in chemistry.
For HCl:
37 gr. HCl : 100 gr. Solution = 2 gr. HCl : X gr. Solution
5.4 gr. of Solution (37% HCl) contain 2 gr. of HCl
Or:
5.4 ml. of Solution (37% HCl)  > 2 gr. of HCl
For Formic Ac.:
88 gr. Formic Ac. : 100 gr. Solution = 8 gr. Formic Ac. : Y gr. Solution=20
9.1 gr. of Solution (88% Formic Ac.) contain 8 gr. of Formic Ac.
Or:
9.1 ml. of Solution (88% Formic Ac.)  > 8 gr. of Formic Ac.
Total solution = 5.4 + 9.1 = 14.5 ml.
So I have to add 100 – 14.5 = 85.5 ml. of H2O
Best Regards,
Massimo
 Mer 8/10/08, jstaruk ha scritto:
Da: jstaruk
Oggetto: [Histonet] Simple (?) equation question
A: histonet@lists.utsouthwestern.edu
Data: Mercoledì 8 ottobre 2008, 18:07
Hello,
I want to make a 2% HCl and 8% formic acid decalcifying solution. Since
straight HCl is 37%, do I treat this as 100% (like you do using formalin),
so the formula will simply be 98 water and 2 HCl or do I have to fraction it
out so a 2% solution will actually be 95 water to 5 HCl?
Also, the same question is for the formic acid, which is actually 88%
My choices to make a 2% HCl and 8% formic acid solutions is either:
A) 2 HCl, 8 formic acid and 90 water
Or
B) 5 HCl, 8.8 formic acid and 86.2 water
Thanks
Jim
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