Question detail
If 15 g of potassium nitrate (KNO3) is dissolved in 0.75 dm³ of solution, what is the concentration of the solution in g/dm³?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Use of amount of substance in relation to masses of pure substances
Question
If 15 g of potassium nitrate (KNO3) is dissolved in 0.75 dm³ of solution, what is the concentration of the solution in g/dm³?
Answer
20 g/dm³
Explanation
This question assesses the understanding of how to calculate concentration from mass and volume. It requires the application of the concentration formula, reinforcing the concept of concentration in solutions.
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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