2006-11-30 01:33:24 · 3 answers · asked by vasu 2 in Science & Mathematics ➔ Chemistry
Well this is concept of a 'in situ' reaction. Putting it simply, we use a freshly prepared solution so that the solution does not go any external effects(like reduction/oxidation with air) or internal effects(settling down). The reaction of Fehling solution is likely to continue anyway but the effectivity would be reduced over time as for the above mentioned reasons....I could get more 'chemical' but for a basic understanding this should suffice!
2006-11-30 06:10:47 · answer #1 · answered by i_dhruv 1 · 0⤊ 0⤋
the solutions have to be freshly prepared because fehlings reagent is used as an oxidizing agent and if not freshly prepared it may not oxidize aldehyde to acid as Cu(OH)2 gradually loses its reactivity as it reacts with oxygen
2006-11-30 18:16:46 · answer #2 · answered by devil_b 2 · 0⤊ 0⤋
Because they might undergo reduction and loose their property to react with the substance being determined.
2006-11-30 01:49:11 · answer #3 · answered by ? 7 · 0⤊ 0⤋