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Universal indicator is used to determine the approximate pH of a solution based on color changes. Here's how it relates to acidity and alkalinity:
Acidity: Solutions with a pH below 7 are acidic. The lower the pH, the stronger the acid. For example, a solution with a pH of 1 would be highly acidic.
Alkalinity: Solutions with a pH above 7 are alkaline (basic). The higher the pH, the stronger the base. For example, a solution with a pH of 13 would be highly alkaline.
Neutrality: A pH of 7 is considered neutral. This is the pH of pure water.