chemicals that change colours in the presence of hydrogen and / or hydroxide ions
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- a chemical dye that changes color depending on the hydrogen ion or hydroxide ion concentration in the same solution. Litmus, for example, is blue in a basic solution (high hydroxide ion concentration) and red in acidic solution (high hydrogen ion concentration)
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answer / Indicator - a chemical dye that changes color depending on the hydrogen ion or hydroxide ion concentration in the same solution. Litmus, for example, is blue in a basic solution (high hydroxide ion concentration) and red in acidic solution (high hydrogen ion concentration).
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