Learn the procedure for making an alkali blue 6B 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. They are added to the reaction mixture to find the endpoint or equivalence point of the titration.
Alkali blue 6B (C37H29N3O3S) is a chemical compound, chemically described as sodium para-rosaline mono sulphonate.
Alkali blue 6B has been used as a pH indicator for the non-aqueous titration method, which changes color from blue to greenish-red and its pH range is 9.4 (Blue) to pH 14.0 (Red). Alkali Blue 6B is a solid that is a dark blue powder. It is soluble in ethanol, but not in water.
How to prepare dichlorofluorescein indicator for titration:
- Accurately weigh 2 g of Alkali blue 6B 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 20.0g/L.
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