How is red cabbage used as …
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Posted by Parteek Garg 5 years, 10 months ago
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Meghna Thapar 5 years, 10 months ago
Red cabbage indicator is a purple coloured solution that is used to test whether substances are acid or base. Red cabbage that is often found in homes can be used to prepare a solution that acts as pH indicator. The cabbage basically contains a pigment molecule called flavin or anthocyanin that changes colour depending on the acidity of the solution.
Normally, the purple solution turns red in colour when it combines with something acidic and it turns green in colour when it combines with a base. If the substance does not cause the colour to change then it is mostly neutral.
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