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10% solution [Jun. 29th, 2011|09:29 pm]
Chemistry Help

chemistryhelp

[sarah1234567891]
HI

I need to make  10% formic acid   (my formic acid has a 88% purity)


i'm confused as to how to do this. let's use 100 mL to make it easier to calculate.


Do I:

A.  10 mL formic acid + 90 mL H20

or

B. 10 mL formic + 100 mL H2O?


When do I use A and when do I use B to calculate?



I was making a 0.1% Formic acid in water 1 L solution, I used calculation B to make the solution.  1.14 mL of formic acid + 1000mL H2O.
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Comments:
[User Picture]From: smokeline
2011-06-30 04:22 pm (UTC)
I guess it depends on whether the purity is by volume, concentration, or weight. The calculations would be different based on that. (And also whether the 4.25% solution is 4.25% by volume, concentration, or weight.)
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