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

Answer 1

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

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#

Therefore, a change in the solution's color indicates a successful test.

This color change now goes through a series of steps that roughly correspond to the amount of reducing sugar that is present.

#Blue - 0%#

#Green -0.5 g %#

#Yellow - 1 g%#

#Oran g e - 1.5 g%#

#Red - 2 g%#

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

Thus, another name for Benedict's test is the semiquantitative test.

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Answer 2

Naomi Aronson

Benedict's reagent is an indicator for the presence of reducing sugars in a solution.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.