Benedict's quantitative reagent is a modification of qualitative aspects. It contains copper sulphate-sodium carbonate. It also contains potassium thiocyanate and small amount of potassium ferricyanate. The thiocyanate causes with the precipitation of white cuprous thiocyanate rather than red cupric oxide.
Benedict's Quantitative Solution contains copper(II) sulfate, sodium citrate, sodium carbonate, potassium thiocyanate, and potassium ferrocyanide. Each plays a role in the determination of reducing sugars:Copper(II) sulfate provides the copper(II) ions that are reduced by the reducing sugar.
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