Q.

Indicators             pH range
Methyl orange      3.1 – 4.5
Phenolphthalein   8.0 – 9.8
Methyl Red            4.2 – 6.3
Pick out the correct statements

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a

Methyl red is used for the titration of weak acid Vs strong base.

b

Methyl orange is used for weak acid Vs strong base titrations

c

Phenolphthalein or methyl red can be used for strong acid and strong base titrations.

d

Methyl orange or methyl red can be used for strong acid Vs weak base titrations.

answer is C, D.

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Detailed Solution

Compare the indicator ranges with the nature of the titration.

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Indicators             pH rangeMethyl orange      3.1 – 4.5Phenolphthalein   8.0 – 9.8Methyl Red            4.2 – 6.3Pick out the correct statements