Indicators are used to find out if substances are acids or bases.
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⭐ Indicators are organic substances that change colours at certain pH values. In order to determine whether a substance is an acid or base you must use both red and blue litmus paper. This is mainly to determine if the substance is neutral because the paper will stay the same colour in both.
Explanation:
⭐ Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators. Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice.
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