Red cabbage indicator

Red cabbage indicator

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Caption: Red cabbage indicator being compared in acid and alkaline solutions. Changes in colour (here from purple to red or yellow) are a common way to test the pH of a solution. Alkali and acid are the two parts of the pH scale, indicating the hydrogen ion concentration in a solution relative to that found in water. Alkalis (pH 8-14) contain fewer free hydrogen ions than water, while acids (pH 1- 6) contain more. Water (pH 7) is considered neutral.

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