Learn the procedure for making pyridylazo naphthol 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.
Pyridylazonaphthol (C15H11N3O) is an orange-colored dye chemically described as 1-(2-Pyridylazo)-2-naphthol (PAN) which is used as an acid-base/complexometry/metal indicator. It comes in the form of orange powder which is soluble in ethanol but insoluble in water.
When copper ions are present in an acidic solution, it produces a yellow color. However, when these ions are absent, the solution becomes red. It is a useful indicator in complexometric titrations because it may form chelates with metal ions.
How to prepare pyridylazo naphthol indicator for titration:
- Accurately weigh 100 mg of pyridylazo naphthol and pour it into a 100 mL volumetric flask with 50 ml of methyl alcohol.
- Once it is dissolved, dilute it to 100.00 mL with methyl alcohol.
- The concentration of the prepared solution is about 01 g/L.
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