Question detail
What volume of solution in dm³ is needed to dissolve 8 g of KCl at a concentration of 2 g/dm³?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
- A. 4 dm³
- B. 2 dm³
- C. 1 dm³
- D. 0.5 dm³
Answer
4 dm³
Explanation
The volume can be calculated using the formula: volume = mass / concentration. Here, volume = 8 g / 2 g/dm³ = 4 dm³.
Common mistake
Common Mistake in Rearranging Concentration Equation
Students often confuse the relationship between mass, volume, and concentration, leading to incorrect rearrangements of the equation.
To correctly rearrange the equation, remember that concentration (c) is calculated as mass (m) divided by volume (V). Thus, to find mass, rearrange to m = c × V, and for volume, rearrange to V = m / c. Keep the correction anchored to Concentration of solutions; check formula, substitution, calculation, final answer, and unit where relevant.
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