Strong Acid: Hydrochloric acid, pH 0-2, UI turns red, Lots of H+ ions released, Weak Acid: Ethanoic acid, pH 3-6, UI turns orange or yellow, Few H+ ions released, Strong Alkali: Sodium hydroxide, pH 11-14, UI turns purple, Lots of OH- ions released, Weak Alkali: Ammonia, pH 8-10, UI turns blue, Few OH- ions released, Neutral: Water, Sodium chloride solution, pH 7, UI turns green, Same number of H+ ions as OH- ions,

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