A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. Hence, a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model.
something that gives information or shows something; a sign
the abstract science of number, quantity, and space, either as abstract concepts ( pure mathematics ), or as applied to other disciplines such as physics and engineering ( applied mathematics ).
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Answer:
A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. Hence, a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model.
something that gives information or shows something; a sign
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the abstract science of number, quantity, and space, either as abstract concepts ( pure mathematics ), or as applied to other disciplines such as physics and engineering ( applied mathematics ).