JAMB - Biology (2007 - No. 6)
A crucible of 5g weighed 10g after filling with fresh soil. it is then heated in an oven at 100°C for 1 hour. After cooling in a desiccator, the weight was 8g.The percentage of water in the soil is
80%
60%
20%
40%
Explanation
Weight of crucible = 5g
Weight of crucible + fresh soil before heating = 10g
Weight of crucible + fresh soil after heating = 8g
Weight of water loss = 10 - 8 = 2g
% H2O in soil = \(\frac{water loss}{wt. of fresh soil}\times 100\)
= \(\frac{2}{5}\times 100\)
= 40%
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