When an indicator changes color during a titration, it is a sign that

When an indicator changes colour during titration it is a sign that the end point [equivalence point] has been reached. The equivalence point of a neutralization reaction is the point at which chemically equivalent quantities of acid and base have reacted together. At this point, the moles of acid is equivalent to the moles of base. Indicators are usually used to identify the equivalent point.

Anions are negative charged ions

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