We’re being asked which indicator is most suitable for the titration of 0.10 M lactic acid solution with 0.10 M KOH(aq).
Since lactic acid has a pKa value greater than 0, it’s a weak acid. Also, note that KOH is a strong base.
This means we have a weak acid-strong base titration.
Which of the following indicators would be most suitable for the titration of 0.10 M lactic acid solution with 0.10 M KOH(aq)? For lactic acid, pKa = 3.08
(a) methyl orange (pKIn = 3.4)
(b) thymol blue (pKIn = 1.7)
(c) alizarin yellow (pKIn = 11.2)
(d) bromophenol blue (pKIn = 3.9)
(e) phenol red (pKIn = 7.9)
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