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CHEMISTRY

JAMB 2004 - Question 21

Chemistry 2004 JAMB Past Questions - Question 21: What volume of 0.5 mol dm-³ H2SO4 will exactly neutralize 20cm³ of 0.1 mol dm³ NaOH solution?

What volume of 0.5 mol dm-³ H2SO4 will exactly neutralize 20cm³ of 0.1 mol dm³ NaOH solution?

A: 2.0 cm³

B: 5.0 cm³

C: 6.8 cm³

D: 8.3 cm³

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Correct Answer

Explanation

2NaOH + H2SO4 → Na2SO4 + 2H2O
CaVa/CbVb = ratio of acid/ratio of base
(0.5 * Va)/(0.1 * 20) = 1/2
∴ Va = 2.0cm