Which one of the following indicators is best suited for titrating 0.40 M ammonia (pKb = 4.74) with 0.40 M HCl?   A.  Alizarin yellow, pKa = 11.2   B.  Phenol red, pKa = 7.9   C.  Bromocresol purple, pKa = 6.3   D.  Methyl red, pKa = 5.0   E.  Bromophenol blue, pKa = 3.9

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
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Chapter14: Principles Of Neutralization Titrations
Section: Chapter Questions
Problem 14.6QAP
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Which one of the following indicators is best suited for titrating 0.40 M ammonia (pKb = 4.74) with 0.40 M HCl?

  •  
    A. 

    Alizarin yellow, pKa = 11.2

  •  
    B. 

    Phenol red, pKa = 7.9

  •  
    C. 

    Bromocresol purple, pKa = 6.3

  •  
    D. 

    Methyl red, pKa = 5.0

  •  
    E. 

    Bromophenol blue, pKa = 3.9

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