Finding the percentage strengh
by Jamie
(Houston Tx)
If 15 grams of 1% ointment are combined with 30 grams of 2.5% ointment, what is the percentage strength of the final product ?
Reply (by Keith)
I would use the C1V1 = C2V2 formula
However, in this case it's going to be C1V1+C2V2 = C3V3
C1= Concentration of 1st Sol.
V1= Volume of 1st Sol.
C2= Concentration of 2nd Sol.
V1= Volume of 2nd Sol.
C3= Concentration of 3rd Sol.
V3= Volume of 1st Sol.
(15)(.01)+ (30)(.025)= (45)(X)
.15 + .75 = 45X
.90 = 45X
.02 = X
So, you'd have 45 Grams of 2%
