R: [Histonet] Simple (?) equation question

[Massimo]

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 
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 <jstaruk <@t> masshistology.com> ha scritto:

Da: jstaruk <jstaruk <@t> masshistology.com>
Oggetto: [Histonet] Simple (?) equation question
A: histonet <@t> 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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