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The color change of the phenolphthalein, the indicator, at an end point can be expalined in terms of the following: 1. Acidic form of the indicator absorb light the most at around 500nm (green) while the basic form of the indicator does not absorb light in the visible range. 2. Basic form of the indicator absorbs light most at around 500 nm (green) while the acidic form of the indicator does not absorb light in the visible range.
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The color change of the phenolphthalein, the indicator, at an end point can be expalined
in terms of the following:
1. Acidic form of the indicator absorb light the most at around 500nm (green)...

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