If 20.0 cm3 of 0.5 M solution is diluted to 1.0 dm3. What will be its new concentration?
Correct answer: B. 0.01 M
- A. 0.001 M
- B. 0.01 M
- C. 1.0 M
- D. 10.0 M
Explanation
To find the new concentration after dilution, use the formula M1V1 = M2V2. Here, M1 is the initial concentration (0.5 M), V1 is the initial volume (20.0 cm3 or 0.02 dm3), and V2 is the final volume (1.0 dm3). Solving for M2 gives us M2 = (0.5 M * 0.02 dm3) / 1.0 dm3, resulting in a concentration of 0.01 M. The other options are incorrect because they either assume incorrect calculations or misunderstand the concept of dilution.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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