If a solution is 0.5% (w/v), how many mg/ml is that?
Answers
The solution's mass by volume percent concentration,
m/v %
, tells you the number of grams of solute present for every
100 mL
of the solution.
In your case, the solution is said to have a mass by volume percent concentration of
0.5
%
, which means that you get
0.5 g
of solute for every
100 mL
of the solution.
0.5
%
m/v
=
0.5 g
solute per
100 mL
of the solution
You can thus say that
1 mL
of this solution will contain
1
mL solution
⋅
0.5 g solute
100
mL solution
=
0.005 g solute
To convert this to milligrams, use the fact that
1 g
=
10
3
mg
You will end up with
0.005
g
⋅
10
3
mg
1
g
=
5 mg
Since this represents the number of milligrams of solute present for every
1 mL
of the solution, you can say that the solution has a concentration of
concentration
=
5 mg mL
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