The experiment conducted is the synthesis of aspirin or acetylsalicylic acid, which is later purified through recrystallization.
2007-06-02 22:02:07 · 5 answers · asked by Muhammad I 1 in Science & Mathematics ➔ Chemistry
1. most organic reactions are equilibria, and do not go to completion.
2. the recrystallisation process always loses a bit, too.
2007-06-02 22:21:12 · answer #1 · answered by Gervald F 7 · 0⤊ 0⤋
The theoretical yield is the resulting conversion of the reaction assuming perfect conditions. The actual yield is what you obtain when you physically do the experiment. The percent yield is the actual yield over theoretical yield (how close to *perfect* your experiment was) multipled by 100 to give a percentage. Such that if the reaction was supposed to yield 3g of product (theoretical yield) but you only get 1.5g of product (actual yield) you would have a percent yield of 1.5g/3g = 0.5 * 100% = 50%.
2016-05-19 23:49:52 · answer #2 · answered by ? 3 · 0⤊ 0⤋
This may be due to the following reasons
1.impurities in reactants
2.some quantity might be lost when you are washing the acid with solvent (water)this is due to the solubility of product in water, but the magnitude of loss depends upon how much of solvent you have taken for washing.
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2007-06-06 13:50:10 · answer #3 · answered by Classof1 2 · 0⤊ 0⤋
if u used filter paper than some of ur product remained in the filter paper.. if u transferred ur product to a different beaker etc then u left some behind.. some of it may have evaporated.. ur reaction didnt go to completion... some of it remained in the solvent when recrystallising
2007-06-03 02:53:43 · answer #4 · answered by mars_bar 2 · 0⤊ 0⤋
The theoretical yield is based on a perfect system. Nothing is perfect.
2007-06-03 01:20:57 · answer #5 · answered by xox_bass_player_xox 6 · 0⤊ 0⤋