SOLUTION: I need to make a diluted bleach solution of .005%. Using 250ml of water, how much bleach would I use to bring it to .005% dilution?

Question 812981: I need to make a diluted bleach solution of .005%. Using 250ml of water, how much bleach would I use to bring it to .005% dilution?
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
The percent bleach in the final solution would be:

where 'p' is the percent, b is the amount of bleach and (250+b) would be the total amount of the diluted solution.

We can substitute in the given percentage and solve for b:

Simplifying:

Multiplying by 205+b (to eliminate the fraction:

Simplifying:

Subtracting 0.005b:

Dividing by 99.995:

Simplifying:
(The decimal is a rounded-off approximation.)
So to get the desired dilution, add approximately 0.012500625 ml of bleach.
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