To determine the concentration of salt a salinometer can be used.
This reagent is bromine in solution.
The reagent that is used to test for starch is a mixture of iodine and potassium iodide in water, or an Iodine - KI reagent. If the reagent turns blue-black in color, then starch is present.
Biuret reagent is used to test for protein in urine. It is a common test that students in biology class perform. Urine is added to a test tube, followed by approximately the same amount of Biuret reagent. If the solution turns lavender this means that there are proteins present in the urine.
Lucas reagent is used to test for the presence of alcohols in a substance. It is made from anhydrous zinc chloride and concentrated hydrochloric acid.
benidict's solution
The reagent commonly used to test for proteins is Biuret reagent. It reacts with peptide bonds in proteins to form a color change, ranging from blue (negative) to purple (positive), indicating the presence of proteins in the sample.
A common test for nitrate ion is with diphenylamine.
Used to test prescece of Indole in medium
They are used to hold the tubes when you have to heat them with a reagent in them.
The reagent used in Pauly's reaction is α-naphthol and concentrated hydrochloric acid. This reagent system is used to test for the presence of indole-like compounds in organic molecules.
Sucrose gives a negative reaction to the Benedict's reagent test because it is a non-reducing sugar. Benedict's reagent is used to test for the presence of reducing sugars, which have the ability to reduce the copper ions in the reagent. Since sucrose does not have this ability, it does not give a positive reaction.
Benedict's reagent is commonly used to test for reducing sugars. It is a blue solution that changes color to green, yellow, orange, or red in the presence of reducing sugars.