If 0.20 mol dm-3 NaOH(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH (aq) used. (Na = 23.0,O = 16:0; H = 1.00)

  • A 600cm-3
  • B 625cm3
  • C 10003
  • D 1600 cm 3
waec 2014chemistry

The correct answer is B. 625cm3

Mole = 5/40 = 0.125 mole

:. 0.2 mole NaOH dissolved in 1000 cm3

0.125 mole NaOH dissolved in xcm3

xcm3 = \(\frac{0.215 x 1000}{0.2}\)

= 625cm3

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