What volume of (dm 3 ) of water will be added to 10dm 3 of
CHEMISTRY
JAMB 2022
What volume of (dm3) of water will be added to 10dm3 of 2.0 mol/dm3 HCL acid solution to give a final solution of 0.5 mol/dm3?
- A. 30
- B. 40
- C. 20
- D. 50
Correct Answer: B. 40
Explanation
To make a fixed amount of a dilute solution from a stock solution,
use the formula: C1V1= C2V2
where: V1 = Volume of stock solution needed to make the new solution.
C1 = Concentration of stock solution.
V2 = Final volume of new solution.
C2 = Final concentration of stock solution
2 * 10 = 0.5 * V2
20 = 0.5V2
\(\frac{20}{0.5}\) = V2
= 40dm\(^3\)
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