pH1 - Strong Acid, pH5 - Weak Acid, pH7 - Neutral, pH8 - Weak Base, pH14 - Strong Base, Red - Red litmus paper turns this colour to indicate an acid or neutral substance., Blue - Blue litmus paper turns this colour to indicate a base or neutral substance., Acetic acid - The acid in vinegar, Formic acid - The acid in ant bites, Bright red - Universal indicator in a strong acid appears, Purple - Universal indicator in a strong base appears, Green - Universal indicator in a neutral substance appears,

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