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If 4.12 L of 0.850 M H3PO4 is diluted to a final volume of 10.00 L, what is the resulting concentration?
A2.06 M
B0.850 M
C0.0350 M
D0.350 M
Answer & Solution
Correct answer: D. 0.350 M
1. Dilution leaves the moles of acid unchanged, so C1V1 = C2V2.
2. Solve for the new concentration: C2 = 0.850 M x 4.12 L / 10.00 L.
3. The result is 0.350 M.
4. Sanity check: the volume grew by roughly 2.4 times, so the concentration must fall by the same factor.
5. The value 2.06 M puts the volumes in upside down, making the diluted acid stronger than the stock.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_
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