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Certain substances will change color at specific pHs
Certain substances will change color at specific pHs
This lets us visually see when pH changes and can let us know the progress of a Neutralization Reaction
Indicators only work over specific ranges
Indicators only work over specific ranges
For instance, phenolphthalein will be colorless when at a pH below 8.3, but will then turn a bright pink once it is between 8.3 and 10.0.
Other indicators can even experience more than one change in color at different pHs.
Phenolphthalein is one of the most commonly used indicators.
Table M in the Reference Tables can help us decide which indicator to use for which reaction
Table M in the Reference Tables can help us decide which indicator to use for which reaction
For example, if you know your desired pH for the endpoint of a reaction is around an 8, you should choose phenolphthalein as an indicator- be on the look out for its PINK color change.Â
The color change is seen when the indicator enters its given pH range. For example, when methyl orange is below 3.1 and above 4.4 pH, it is red. But when it is in between those two values, it is yellow.
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