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Acid-base indicators

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Reference no: EM131906579

Part 1: What is the pH of a 0.18 M solution of methy- lammonium nitrate (CH3NH3NO3)? Kb for methylamine (CH3NH2) is 5.0 × 10-4. 

Part 2: A 10 mL sample of 0.3 M NH4Cl is titrated with 0.1 M NaOH. What is the pH of the so- lution after 70 mL of NaOH has been added? 

Part 3: 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

2. Any of these is suitable.

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

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

5. None of these is suitable. 

Reference no: EM131906579

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