Problem: Use Figure 19.9 to find an indicator for these titrations: (a) 0.25 M C6H5COOH (see Appendix C) with 0.25 M KOH

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Weak acid + Strong base titration:

  • benzoic acid → C6H5COOH → Ka = 6.5 x 10-5 → weak acid
  • NaOH → strong base


At equivalence point: pH > 7

  • molesacid = molesbase
    • final volume of base = twice initial volume
    • final volume of acid = half initial volume 


pKa = pH halfway from equivalence point:


pKa=12pHpH=2(pKa)pH=2(-log[Ka])

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Problem Details

Use Figure 19.9 to find an indicator for these titrations: 

(a) 0.25 M C6H5COOH (see Appendix C) with 0.25 M KOH

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.