Easy way to calculate the dilution, for any concentration, to make any volume you want.
Equation is: C1 x V1 = C2 x V2
C1 and C2 are concentrations, C1 is the concentration you start with, C2 is the concentration you want.
Let's say C1 = 91% and C2 = 70%
V1 and V2 are starting (V1) and ending (V2) volumes.
If you want 50 ml of 70% alcohol, just re-arrange the equation and solve.
C1 x V1 = C2 x V2 Put in your numbers:
0.91 x V1 = 0.70 x 50
Re-arrange:
(0.70 x 50) / 0.91 = V1 = 38.5 ml
So, mix 38.5 ml of 91% alcohol with distilled water to make 50 ml (= add 11.5 ml) and you should have 50 ml of 70% alcohol.
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