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
Starch is not the indicator. Iodine is the indicator of starch.
To test for protein. Biuret or solutions of sodium hydroxide and copper sulfate. Tested with a dropper a + result will be purple or something
Phenolphthalein is typically used as a base indicator as it changes color in the presence of bases. Bromthymol blue can be used as both an acid and a base indicator, with different color changes for each.
To detect maltose, you can use the Benedict's test. Benedict's reagent will change from blue to red or yellow in the presence of reducing sugars like maltose.
Fehling's solution is used to test for the presence of reducing sugars, while Tollens reagent is used to test for the presence of aldehydes. Fehling's solution contains cupric ions, while Tollens reagent contains silver ions. When a reducing sugar reacts with Fehling's solution, a brick-red precipitate forms, while with Tollens reagent, silver ions are reduced to form a silver mirror on the test tube.
An indicator shows when we have added just enough of the second reagent to react with the first. If you mean why do we add only a small amount of indicator, it is to keep the answer accurate. Some of the reagent is used changing the indicator so the answer is always slightly bigger than perfection, and the more indicator you add, the larger the error.
Patton and Reeder's reagent is a stain used in histology for the identification of lipids. It is a mixture of osmium tetroxide and potassium dichromate. When tissues are stained with Patton and Reeder's reagent, lipids appear black or dark brown in color under a microscope.
what is the difference between the external & internal indicator
The reagent bottle is not used for dropping, having only a common stopper.
Starch is not the indicator. Iodine is the indicator of starch.
Distinguish between buffer and indicator
Benedicts reagent is used to check reducing sugars , it need hat to work and gives red color when positive ,. While biuret reagent is for proteins .there is no need to use heat and gives purple , violet color when positive ..
difference between acid base indicator and universal indicator
what is the difference between the external & internal indicator
To test for protein. Biuret or solutions of sodium hydroxide and copper sulfate. Tested with a dropper a + result will be purple or something
There is a difference
Phenolphthalein is typically used as a base indicator as it changes color in the presence of bases. Bromthymol blue can be used as both an acid and a base indicator, with different color changes for each.