SOLUTION: if the phosphoric acid is 85 percent pure then to make 3 percent how much should be added to 10 ltr water

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Question 950649: if the phosphoric acid is 85 percent pure then to make 3 percent how much should be added to 10 ltr water
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The density or at least specific gravity is needed. The concentration 85% should mean "weight per weight". "ltr" appears to mean "liters", and this is volume. No density - no solving.

Continuing staying all with mass ("weight"),

10*liters of water,

10%2Aliters%2A1000%28ml%2Fliter%29%2A1%28gram%2Fml%29%281%2F1000%29%28kg%2Fgrams%29

10%2Akilograms, the starting mass of water.

An old handbook shows listed, 1.689 for specific gravity of 85% phosphoric acid; and temperature may be ignored just for convenience.

Let p be mass in kilograms of the 85% acid to add.
highlight_green%2885%2Ap%2F%28p%2B10%29=3%29
Solve for p.