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, $C u S 0_{4}, N a - c a r b o n a t e and N a - c i t r a t e$ $CuS0_4,Na-carbonate and Na-citrate$

In presence of alkaline media created due to $N a - c a r b o n a t e$ $Na-carbonate$ reducing sugar undergoes ene-diol transformation as a result of this $C u^{+ 2}$ $Cu^(+2)$ in $C u S O_{4}$ $CuSO_4$ (blue) gets reduced to $C u^{+}$ $Cu^+$ of $C u_{2} O$ $Cu_2O$ (red).

$N a - c i t r a t e$ $Na-citrate$ causes slow release of $C u^{+ 2}$ $Cu^(+2)$ from $C u S O_{4}$ $CuSO_4$

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.

$B l u e - 0 %$ $Blue - 0%$

$G r e e n - 0.5 g %$ $Green -0.5 g %$

$Y e l l o w - 1 g %$ $Yellow - 1 g%$

$O r a n g e - 1.5 g %$ $Oran g e - 1.5 g%$

$R e d - 2 g %$ $Red - 2 g%$

$B r i c k R e d -_{-}^{>} 2.5 g %$ $Brick Red - _-^> 2.5 g %$

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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