Learn the procedure for making a dimethyl yellow indicator solution.
The compound that changes color when exposed to acidic or basic solutions is called an indicator. Most of the time, color indicators are used to measure pH. To find the endpoint or equivalence point of the titration, they are added to the reaction mixture.
Dimethyl yellow (C14H15N3) is an organic compound chemically described as 4-(Dimethylamino)azobenzene, N,N-Dimethyl-4-(phenylazo)aniline, Butter yellow, Methyl yellow. It is used as an acid-base indicator, as well as an indicator for non-aqueous titration which changes from yellow to red through a pH range pH 2.9 to pH 4.00.
Dimethyl yellow comes in the form of a yellow to orange-brown powder that is soluble in alcohol, benzene, chloroform, ether, and petroleum but, insoluble in water.
How to prepare dimethyl yellow indicator mixture for titration:
- Accurately weigh 100 mg of calcein and pour it into a 100 mL volumetric flask with 50 ml of rectified spirit.
- Once it is dissolved, dilute it to 100.00 mL with rectified spirit.
- The concentration of the prepared solution is about 01 g/L.
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