Benedicts reagent is an indicator for the presence of what in a solution?

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Benedicts reagent is an indicator for the presence of what in a solution?

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Answer 1 · 2018-03-11T10:37:54

Reducing sugar and reducing sugar like substances like creatinine,uric acid,homogentisic acid etc.

Explanation:

Benedict's reagent conatins, $CuS0_4,Na-carbonate and Na-citrate$

In presence of alkaline media created due to $Na-carbonate$ reducing sugar undergoes ene-diol transformation as a result of this $Cu^(+2)$ in $CuSO_4$ (blue) gets reduced to $Cu^+$ of $Cu_2O$ (red).

$Na-citrate$ causes slow release of $Cu^(+2)$ from $CuSO_4$

So,change in colour of the solution is indicated as a positive test.

Now,this change in color proceeds through a steps of color changes,which corresponds roughly to certain amount of reducing sugar present.

$Blue - 0%$

$Green -0.5 g %$

$Yellow - 1 g%$

$Oran g e - 1.5 g%$

$Red - 2 g%$

$Brick Red - _-^> 2.5 g %$

So,Benedict's test is also called Semiquantitative test.

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Benedicts reagent is an indicator for the presence of what in a solution?

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