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JAMB Chemistry 1989 Question 4

Question 4

Volumetric Analysis

20.00 cm3 of a solution containing 0.53 g of anhydrous Na2CO3 in 100 cm3 requires 25.00 cm3 of H2SO4 for complete neutralisation. The concentration of the acid solution in moles per dm3 is [H = 1, C = 12, O = 16, Na = 23, S = 32]

  1. A.0.02
  2. B.0.04
  3. C.0.06
  4. D.0.08
Show the answer and explanation

Answer: B (0.04)

Explanation

Na2CO3 concentration = 5.3 g dm−3 ÷ 106 = 0.05 M. The reaction is 1 : 1, so MA × 25 = 0.05 × 20, giving MA = 0.04 mol dm−3.