What are indicators? Discuss the theory of indicators.
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An indicator is a substance which is used to determine the end point in a titration. In. acid-base titrations, organic substances (weak acids or weak bases) are generally used. as indicators. They change their colour within a certain pH range.
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According to this typology, there are four types of indicators: input, output, outcome and impact. The MERG Glossary of M&E Terms defines each of these types as follows: Input. A resource used in a programme, including financial and human resources from a variety of sources, as well as curricula, materials, etc.
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