50 mL of 0.1 mol/L HCl neutralises 20 mL of NaOH solution. What is the concentration of the NaOH?
Answer and explanation
Correct answer: D. 0.25 mol/L
- Step 1: The mole ratio HCl : NaOH is 1 : 1, so Ca Va = Cb Vb.
- Step 2: Cb = 0.1 x 50/20 = 0.25 mol/L.
Answer
0.25 mol/L.
Why not the others: 0.04 mol/L, 0.1 mol/L and 0.5 mol/L do not fit.
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