Learn the procedure for making sodium alizarin sulfonate 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.
Sodium alizarin sulfonate is a chemical compound, chemically described as sodium 1,2-dihydroxy-9, 10 anthraquinone-3-sulphonate, used as a metal indicator. It comes in the form of yellow-orange powder which is soluble in water and ethanol.
At a pH of about 4.0, it produces a bluish-red lake with thorium and aluminum ions, However, the solution turns yellow when these ions are absent.
How to prepare sodium alizarin sulfonate indicator for titration:
- Accurately weigh 100 mg of sodium alizarin sulfonate and pour it into a 100 ml volumetric flask with 50 ml of distilled water.
- Once it is dissolved, dilute it to 100.00 mL with distilled water.
- The concentration of the prepared solution is about 01 g/L.
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