Why do you need to use "excess" Benedict's reagent if you want to get an idea of the concentration of a sugar solution?
And how could you use the Benedict's test to estimate the concentration of a solution of a reducing sugar?
2007-10-04 05:33:53 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
In order to coax the sugar from the "inactive" cyclic state to the "active" linear state.
2007-10-04 05:48:43 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋
You can use the test for reducing and non reducing sugars but it will only change colour in the presence of reducing sugars. If reducing sugars are present then it will turn from blue to green to yellow to orange to brick red. If nothing happens then add Hydrochloric acid to break the bonds, then neutralise with Sodium Hydrogencarbonate. And repeat, if there were none-reducing sugars present they will now be reducing sugars and will change the colour of the solution. If nothing happens there are no sugars there.
2016-05-20 23:07:13 · answer #2 · answered by ? 3 · 0⤊ 0⤋
stoichiometry
2007-10-04 05:48:36 · answer #3 · answered by Carborane 6 · 1⤊ 0⤋