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Simple Formula for Diluting Solutions
The following is a simple method to dilute solutions
A = Strength (%) of the solution to be diluted
B = Diluting solution (%) <water = 0>
S = Desired strength
1. S – B = X
2. A – S = Y
3. X parts A + Y parts B = S
Example: Dilute 10% povidone iodine to 2%
1. 2 – 0 = 2 (2% desired – 0% <water> = 2
2. 10 – 2 = 8 (10% povidone – 2% desired = 8
3. 2 parts povidone + 8 parts water = 2% solution