What volume of 0.20 mol dm -3 NaOH solution would yield 5.0 g of NaOH on evaporation to dryness? [NaOH = 40g mol-1]

  • A 400 cm3
  • B 625 cm3
  • C 1000 cm3
  • D 1600 cm 3
waec 2003chemistry

The correct answer is B. 625 cm3

Conc. g/dm3 = 0.20 x 40 gmol -1 = 8 g/dm3

1000 cm3 of 0.20m NaOH contains 8g of NaOH :. 5g of NaOH will be contained in 5/8 x 1000 x 625cm3

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