# 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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87% (157 ratings)
###### 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.

87% (157 ratings) ###### 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)

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Acid Base Indicators concept. If you need more Acid Base Indicators practice, you can also practice Acid Base Indicators practice problems.

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Based on our data, we think this problem is relevant for Professor Biberdorf's class at TEXAS.