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If you were to plot pH versus the volume of added titrant, you would generate a pH titration curve. The equivalence point at which the acid and base have neutralized each other occurs at the midpoint of the steepest part of this curve. This is why the titrant is added slowly and in small quantities, in order to catch the steep part of the curve and not jump over it. A pH meter can be used to monitor the pH and identify the equivalence point or an indicator substance that exists in both acid and base forms, and changes color at or near the equivalence point pH can be used. When selecting an indicator, it is important to know the color change pHs of all available indicators.