Universal indicator, neutral solution

Universal indicator, neutral solution

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Caption: Universal indicator in a neutral solution in a conical flask being held by a student carrying out an analysis of acids and bases. Universal indicator is a mixture of chemicals that changes colour according to the hydrogen ion concentration (expressed as pH values) of the solution in which it is placed. Universal indicator is red in strong acids, orange in weak acids, green in neutral solutions, and blue to purple in alkaline solutions.

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