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pH Indicators
Acid-base indicators are used to help us visualize when the equivalence point is reached during a titration of either an acid or a base. For example, if we are titrating an acidic solution, we place a small amount of acid indicator into that solution. Initially at a very low pH (acidic pH) the acidic indicator does not dissociate into its conjugate base and conjugate base. However as we add more of the basic titrant, the pH increases and the indicator begins to dissociate. Eventually when the ratio of the concentration of the acid indicator to its conjugate base reaches a certain point, the solution changes colors. This represents the equivalence point of the solution under titration.
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