A student has 200 mL of a sodium chloride solution. After heating, all the water evaporates and 15 g of sodium chloride remains. What is the concentration of the solution in grams per litre?
Answer
75 g L⁻¹
The correct answer is 75 g L⁻¹ — State the result in the requested units.
Step-by-step solution
- Write down the mass of solute: 15 g.
- Convert the volume of solution to litres: 200 mL = 0.200 L.
- Apply the formula concentration = mass ÷ volume.
- Calculate: 15 g ÷ 0.200 L = 75 g L⁻¹.
- State the result in the requested units.
Common mistake: Using mL as litre or forgetting to convert volume
Concept tested: Concentration (mass/volume) calculation
Published · How this solution was prepared and checked
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