Answer to Question #56206 in General Chemistry for jocelyn
Usually, it is quite difficult to find an exact equivalence point in each experiment. Therefore, during the titration the end point is determined. This is the closet point behind the equivalence point when the change of color of indicator occurs. For example, phenolphtalein (the change of color at pH = 8.2 - 10) and methyl orange (the change of color at pH = 3.2 - 4.4) are commonly used for acid-base titration.
The value which equals the difference between equivalence point and the end point is known as an indicator error.
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