Want this question answered?
The reagent used in the Biuret Test is a solution of copper sulfate (CuSO4) and potassium hydroxide (KOH). The KOH is there to raise the pH of the solution to alkaline levels; the crucial component is the copper (II) ion from the CuSO4. When peptide bonds are present in this alkaline solution, the copper (II) ions will form a coordination complex with four nitrogen atoms involved in peptide bonds. Copper Sulfate solution is a blue colour, but when the copper (II) ions are coordinated with the nitrogen atoms of these peptide bonds, the colour of the solution changes from blue to violet. This colour change is dependent on the number of peptide bonds in the solution, so the more protein, the more intense the change. When the peptides are very short, the solution turns a pink colour, rather than violet.
A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH (acidity or alkalinity) of the solution can be determined easily. Normally, the indicator causes the colour of the solution to change depending on the pH.
card. + Kedde's reagent (3,5- dinitrobenzoic acid + NaOH → violet colour.
The color not change.
When being tested with biuret reagent, protein turns a blue to lilac color. However, starches when tested do change to a blackish blue color.
Intense Red Colour
A colour change from the original blue to a brick red colour, although various intermediary colours can also form depending on the concentration of the glucose.if reducing suger is present the colour of the solution will turn to brick red and that will be a positive test.my answer: Benedict's reagent contains copper sulphate, since glucose is educing sugar it will turn Cy +2 into a reagent , to cu +1.
The reagent used in the Biuret Test is a solution of copper sulfate (CuSO4) and potassium hydroxide (KOH). The KOH is there to raise the pH of the solution to alkaline levels; the crucial component is the copper (II) ion from the CuSO4. When peptide bonds are present in this alkaline solution, the copper (II) ions will form a coordination complex with four nitrogen atoms involved in peptide bonds. Copper Sulfate solution is a blue colour, but when the copper (II) ions are coordinated with the nitrogen atoms of these peptide bonds, the colour of the solution changes from blue to violet. This colour change is dependent on the number of peptide bonds in the solution, so the more protein, the more intense the change. When the peptides are very short, the solution turns a pink colour, rather than violet.
i don't believe it does
Indicator will changes the colour according to H+ ion present in a solution. Reagent : consist of electrophile and nucleophile. It help in the attachment of nucleophile to the electrophile and electrophile to the nucleophile. Mirza
A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH (acidity or alkalinity) of the solution can be determined easily. Normally, the indicator causes the colour of the solution to change depending on the pH.
the glucose would remain yellow which is the initial colour of the seliwanoff's reagent. the fructose however being a ketose forms a furfural because of the HCL present in the seliwanoff reagent and reacts with the resorcinol to give a red cherry or pink colour.
A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH (acidity or alkalinity) of the solution can be determined easily. Normally, the indicator causes the colour of the solution to change depending on the pH.
Alkaline levels are essential for the solution to change colour. Without alkaline levels, the colour of the solution would not be detectable.
Litmus does not change color in sugar solution.
card. + Kedde's reagent (3,5- dinitrobenzoic acid + NaOH → violet colour.
Litmus contains organic chemicals that have a particular colour (some kind of red) when protonated - that is, in acidic conditions - but a different colour (blue) when in basic conditions or when they have donated protons. We see this colour change and can identify whether a solution is nonacidic or nonbasic by using one of these strips.