Not sure about you guys, but I felt that Isaac Cheong could be right. The question did contain an error...
Section B: the question regarding the yield of the salt NaBr.
It was stated that the concentration of NaOH was o.8mol dm-3...
and the volume of the NaOH was 25.0cm3
Technically, we were supposed to divide 25.0 by 1000 to get the volume in dm3
And if you did that, the final answer you would have gotten may be 689% had you assumed the experimental yield was 14.2g...
Obviously, yields cannot exceed 100%... It's impossible in real life...
But if you used 1.42g, the answer would be much more logical - 68.9%.
I don't know what you think, but I think that question was wrong. Anyone else?
P.s.: I am trying not to reveal too much of that question so the absentees can have a fair test.
Tuesday, October 09, 2007
Regarding the Chem paper...
the post was brought to you by ronaldLIONG| at the time of 2:02 PM
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