SOLUTION: What volume of a 2.5 M stock solution of H3PO4 is needed to prepare 3.8 L of a 1.5 M H3PO4 solution? (1 point) Select one: a. 1.0 L b. 2.3 L c. 5.7 L d. 6.3 L

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Question 824260: What volume of a 2.5 M stock solution of H3PO4 is needed to prepare 3.8 L of a 1.5 M H3PO4 solution? (1 point)

Select one:

a. 1.0 L
b. 2.3 L
c. 5.7 L
d. 6.3 L
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = volume in liters of the stock phosphoric acid to use.

%282.5%2Av%29%2F%283.8%29=1.5

The numerator is the amount of phosphoric acid without any water, and the denominator is the amount of volume of solution. The right side is the concentration wanted. Solve for v.