SOLUTION: i have 500m3 of 40%NaOH how much DM water should i add to get 25%NaOH soluton

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Question 730586: i have 500m3 of 40%NaOH how much DM water should i add to get 25%NaOH soluton
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
One would assume your concentrations are in %w/v, and you want how much water as m^3.

Let v = volume of water to add in units of cubic meters.
highlight%28500%2A40%2F%28500%2Bv%29=25%29
Solve for v.

First couple of steps,
500%2A40=25%28500%2Bv%29
20%2A40=%28500%2Bv%29
800-500=v