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Question

If the equivalence point is at a pH of 8.4 in an acid-base titration, then _______ indicator should be used.

A
methyl violet
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B
alizarin yellow
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C
phenolphthalein
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D
methyl red
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Solution

The correct option is C phenolphthalein
Acid-base titrations depend on the neutralization between an acid and a base when mixed in solution. In addition to the sample, an appropriate pH indicator is added to the titration chamber, reflecting the pH range of the equivalence point. The acid-base indicator indicates the endpoint of the titration by changing color. If the equivalence point is at a pH of 8.4, then the phenolphthalein indicator would be used.

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