Learn the procedure for making a calcon 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.
Calcon (C20H13N2NaO5S) is an azo dye chemically described as, 2-Hydroxy-1-(2-hydroxy-1-naphthylazo) naphthalene-4-sulfonic acid sodium salt that is used as an indicator (metal indicator) for complexometric titrations of calcium with ethylenediaminetetraacetic acid (EDTA) in the presence of magnesium.
Calcon comes in the form of a dark, blackish-brown powder that is soluble in water, ethanol, and methanol. It produces a purple color when calcium ions in an alkaline solution are present and a blue color when these ions are absent.
How to prepare calcon indicator for titration:
- Accurately weigh 100 mg of calcon and pour it into a 100 mL volumetric flask with 50 ml of water.
- Once it is dissolved, dilute it to 100.00 mL with water.
- The concentration of the prepared solution is about 01 g/L.
You may also like this:
No comments:
Post a Comment