A pharmacist adds 10 ml of a 20% w/v solution of a drug to a 500...
A pharmacist adds 10 ml of a 20% w/v solution of a drug to a 500 ml D5W for parenteral infusion. What is the % strength of the drug in the infusion solution?
Homework Answers
In this case, let x1= 20 and x2= 0, since the active ingredient dextrose in D5W is not considered in this case.
The % strength of the drug in the infusion solution can be calculated as
xpph (w/v)= 
=
%/
10ml
( To convert 20% into the quantity of active ingredients , it is multiplied by 10 which is the quantity added).
= 
= 
By direct addition, we get,
= 
= 
= 
= 
% (W/V)
The % strength of drug in infusion solution is 0.39% (W/V).
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