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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.

 From: 2011-06-30 04:41 am (UTC) (Link)
I'm not sure if this is right, but here is my instinct:

M1V1 = M2V2

(0.88)(x) = (0.1)(1L)
 From: 2011-06-30 05:20 am (UTC) (Link)
Yeah, you need the (M1)(V1)=(M2)(V2)

(.88)(x)=(.10)(whatever you want your final volume to be)

Then you add x amount of the formic acid to (final volume - x) amount of water.
 From: 2011-06-30 07:14 am (UTC) (Link)
Can you explain this to me?

I'm following a procedure and they make a 4.25% H3PO4 in buffer

the recipe they use is:

4.25 mL of H3PO4 ( purity 86% density 1.685) + 100 mL buffer

4.25 / 104.25 is not 4.25%

M1V1 = M2V2 doesnt work here. =(