GCE O/L Science Tricks

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GCE O/L Science Tricks

Litmus turns red in acidic solutions and blue in alkaline solutions and is that the oldest and most ordinarily used indicator of whether a substance is an acid or a base. Phenolphthalein, (C20H14O4), an compound of the phthalein family that's widely employed as an indicator . As an indicator of a solution's pH, phenolphthalein is colourless below pH 8.5 and attains a pink to crimson hue above pH 9.0.