How does turmeric change its colour in an alkaline solution?
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Turmeric, which belongs to Genus Curcuma is used as a spice in cooking and its yellowish color is due to the presence of the natural pigment curcumin. Turmeric is a perfect example of a natural pH indicator.
pH of a substance is the measure of its acidic or alkaline levels, which range from 1 - 14. Indicators like turmeric change their color when the pH changes.
Turmeric retains it yellow color when it is exposed to acidic or neutral substances, which have a pH less than 7.4. However, when it is exposed to alkaline substances, which have a pH greater than 8.6 and contain more hydroxide ions than the hydrogen ions, it turns into dark pink or red in color.
pH of a substance is the measure of its acidic or alkaline levels, which range from 1 - 14. Indicators like turmeric change their color when the pH changes.
Turmeric retains it yellow color when it is exposed to acidic or neutral substances, which have a pH less than 7.4. However, when it is exposed to alkaline substances, which have a pH greater than 8.6 and contain more hydroxide ions than the hydrogen ions, it turns into dark pink or red in color.
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Explanation:
As turmeric is yellow in colour, on reaction with alkaline medium or with acid, its yellow color will become faint
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