You calculation is correct: dissolve your 10 mg in 0.4 mL and you
will get the 2.5% solution.
René J
 On Thu, 7/24/08, Nicola J Broadbent wrote:
From: Nicola J Broadbent
Subject: [Histonet] a silly question
To: histonet@lists.utsouthwestern.edu
Date: Thursday, July 24, 2008, 12:36 PM
Hi,
I'm embarrassed to ask this, but I have a basic question about making
percent solutions (% w/v). I wish to make a 2.5% solution of drug A in
saline. I have 10mg of drug A and want to know how much saline to
add to
get a 2.5% solution. The formula I found for making % solutions is:
%solution = (dry mass in grams/volume in mls) *100
According to this formula, I would need to add 0.4ml to 10mg to get a
2.5%
solution. I am not sure whether this is correct however, as my
intuition is
to keep the units the same (mg/mls) and here the amount of saline to be
added would be 400ml. I know this is a bit stupid and I can only
claim that
it is close to Friday and my brain is shutting down...Can someone
resolve
this for me? Help!
Nicola J. Broadbent
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