Need help with titration mc question
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Need help with titration mc question

[From: ] [author: ] [Date: 11-10-14] [Hit: ]
Phenolphthalein: 8.2-10.Alizarin yellow: 10.1-12.Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. For which of the following titrations would methyl red be the best indicator?......
Consider the following pH indicators and their pH range:
Methyl orange: 3.2-3.4
Methyl red: 4.8-6.0
Bromothymol blue: 6.0-7.6
Phenolphthalein: 8.2-10.0
Alizarin yellow: 10.1-12.0

Assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. For which of the following titrations would methyl red be the best indicator?

a. 0.100 M aniline ( K b=3.8 x 10 -10) + 0.100 M HCl
b. 0.100 M HNO3 + 0.100 M KOH
c. 0.100 M HF (Ka=7.2 x 10-4) + 0.100 M NaOH
d. 0.100 M acetic acid (Ka=1.8 x 10 -5) + 0.100 M NaOH
e. 0.100 M NH3 ( Kb=1.8 x 10-5) + 0.100 M HCl

I would be so thankful if anybody can answer this, I have no idea where to start!

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0.100 M NH3 (Kb=1.8x10^-5) + 0.100 M HCl
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