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July 31, 2015

Homework Help: Chemistry

Posted by Douglas on Tuesday, May 10, 2011 at 5:58pm.

Which of the following acid-base indicators should be used for the titration of NH3 with HBr? Kb of ammonia is 1.8 10−5.

1. Methyl red, color change red/yellow at 4.4 < pH < 6.2 correct

2. Any of these is suitable.

3. None of these is suitable.

4. Phenolphthalein, color change colorless/red-violet 8.0 < pH <10.0

5. Neutral red, color change red/yellow 6.8 < pH < 8.0

Why is answer choice 1 correct?

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