The pH range over which an indicator changes color.
transition interval
It depends on the sensitivity of the indicator you are using. There should be a guide with the indicator you are using. Litmus paper, which is the most common form of pH indicator, will change fairly constant across the pH scale, but a neutral (pH 7+/- 0.5 about) solution will normally not cause a change.
Ideally you want an indicator which undergoes its transition somewhere in the range where the pH is changing the fastest; that is, in the most nearly vertical part of the graph of pH vs. volume of titrant added.
Indicators used outside the titration flask are termed as external indicators. A very commonly used external indicator is potassium ferricyanide
It indicates that the solution's range is above or below of its transition value. For example the transition value of phenolphthalein is around 9.0. Hence it shows a pink colour in basic solutions (pH>9) and colourless in acidic solutions.
transition interval
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Metals from the d-block (by opposition with the inner transition metals).
Sometimes one of the reactants in a titration act as an indicator; this is an internal indicator. An example is the volumetric technique of permanganometry.
A table in which properties of elements are repeated after some interval.
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There is always a transition in the middle of an interval
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the variton of transition temperature with respect to mass of iostopic electrons