What volume of 10 mol/L hydrochloric acid must be diluted with water to make 400 mL of 0.5 mol/L solution?
Answer and explanation
Correct answer: D. 20 mL
- Step 1: The moles of solute stay the same on dilution: .
- Step 2: mL.
Answer
20 mL.
Why not the others: 8000 mL: the two concentrations were swapped in . 380 mL: this is the volume of water added. 50 mL: the final volume was left out.
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