Preparation of Potassium Rhodizonate

Gently reflux 10 g of inositol with 25 mL of conc. nitric acid for 3 h, then add water until the total volume reaches 100 mL, then add 50 mL of glacial acetic acid. Place the beaker in an ice bath and with stirring add slowly 40 g of potassium hydroxide, stir at room temperature for 12 h. Place the solution in a freezer, then filter and wash with 100 mL of cold water.

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The acidic solution in an ice bath

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Addition of the potassium hydroxide

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Stirring for 12 h in room temperature

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