Acid-base indicators change color depending on the acidity or alkalinity of a solution, allowing us to visually distinguish between acids and bases based on the color change.
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Acid-base indicators change color depending on the acidity or alkalinity of a solution, allowing us to visually distinguish between acids and bases based on the color change.
Acid-base indicators can distinguish between an acid and a base by exhibiting distinct color changes at different pH levels. For example, litmus paper turns red in acidic conditions and blue in basic conditions. Phenolphthalein is colorless in acidic solutions but turns pink in basic solutions. Methyl orange is red in acidic solutions and changes to yellow and then orange in increasingly basic environments. By adding a small amount of the indicator to the solution of interest, the observed color change provides a visual indication of whether the solution is acidic, neutral, or basic, allowing for qualitative pH assessment.