25 mL of 0.1 mol/L HCl is exactly neutralised by NaOH solution of concentration 0.05 mol/L. What volume of NaOH is needed?
Answer and explanation
Correct answer: D. 50 mL
- Step 1: Moles of HCl = 0.1 x 0.025 = 0.0025 mol. Step 2. Moles of NaOH needed = 0.0025 mol, so volume = 0.0025 / 0.05 = 0.05 L = 50 mL. Answer: 50 mL. Why not the others: 12.5 mL: That inverts the ratio of concentrations. 25 mL: That ignores the different concentrations. 100 mL: That uses the wrong ratio.
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