Question about dilution

by angie
(las vegas)

How many ml of a stock 4% solution should be used to make 3 pints of solution with 100 mg per liter?

Comments for
Question about dilution

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Mar 27, 2011
by: Keith

So, what is 100mg in 1 Liter?

Well, 1000mg/100mL = 1% = .01

so, 100mg/100mL = .1% = .001

So 100mg/1000mL = .01% = .0001

As such, our setup is as follows

(.04)(X) = (1440)(.0001)

Now do the math.

ps. - I know that 1 pint is really 473 mL, but for training purposes we keep the numbers rounded for memorization purposes. Thanks -Keith

Mar 26, 2011
by: Anonymous


Mar 26, 2011
by: Sarah

I get the right answer for the question at the top, but for the one asked by Bonnie, I've worked the problem 2 different ways and I get 125 ml either way. I'm I doing something wrong or is this the right answer?

Mar 24, 2011
need 3.6 ml of 4% solution
by: Anonymous

Would you explain how you arrived at the final concentration percentage? Thanks.

Mar 16, 2011
need 3.6ml of 4% solution
by: Anonymous

use: IV x IF = FV x FS
IV = ?
IF = 4%
FV = 3pints = 3 x 480ml = 1440ml
FS = 100mg/1000ml = 10mg/100ml = 0.010g/100ml
= 1:100 or 0.01%
IV x IF = FV x FS
X x 4% = 1440 x 0.01%
X = 1440x 0.01/4 = 3.6 ml

Jan 31, 2011
by: Anonymous

answer 1.5

Jan 31, 2011
Pharmacy Tech Math help
by: Anonymous

could someone show me a simple way to do this? Its been years since I've done any math or algebra.

Dec 10, 2010
by: Bonnie

How much of a 40% stock solution is needed to make 200 ml of a 25% solution

Dec 02, 2010
question reply
by: Anonymous

25 percent should be used for three liters.

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