Problem: 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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FREE Expert Solution

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.


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Problem Details

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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