WAEC - Chemistry (2014 - No. 16)
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)
600cm-3
625cm3
10003
1600 cm 3
Explanation
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
:. 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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