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.
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Concentration units express the amount of solute in a given amount of solution or solvent. Calculations cover molarity, molality, normality, mole fraction, mass percentage, volume percentage, parts per million and dilution, including the effect of temperature on volume-based units and the distinction between molarity and molality.
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