Chemistry
WAEC 2003
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
Correct Answer: Option B
Explanation
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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