Molarity And Dilution
What volume of 0.5 M H₂SO₄ is required to prepare 250 mL of 0.1 M H₂SO₄ by dilution?
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About This Question
- Subject
- chemistry
- Chapter
- some basic concepts in chemistry
- Topic
- molarity and dilution
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
50 mL
- Apply the Dilution Formula: M1V1=M2V2, where subscripts 1 and 2 refer to the concentrated and diluted solutions respectively.
- Substitute Known Values:
- M1=0.5 M, M2=0.1 M, V2=250 mL.
- 0.5×V1=0.1×250.
- Solve for V1:
- V1=0.50.1×250=0.525=50 mL.
- Practical Interpretation: Take 50 mL of the 0.5 M stock solution and add water to make the total volume 250 mL.
- Conceptual Check: Dilution reduces concentration but conserves the total moles of solute. Moles before = 0.5×0.05=0.025 mol, moles after = 0.1×0.25=0.025 mol. Consistent.
This medium difficulty chemistry question is from the chapter some basic concepts in chemistry, covering the topic of molarity and dilution. It appeared in the 2025 exam.
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