pH1 - Strong Acid, pH5 - Weak Acid, pH7 - Neutral, pH8 - Weak Alkaline, pH14 - Strong Alkaline, Universal indicator paper, Litmus paper, red - Litmus paper turns this colour to indicate an acid., blue - Litmus paper turns this colour to indicate an alkali., pink - Phenolpthalein turns this colour to indicate an alkali, colourless - Phenolpthalein turns this to indicate an acid, green - Universal indicator goes this colour in water, yellow - Methyl Orange turns this colour to indicate an alkali, purple - Universal indicator goes this colour in strong alkalis,

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