Ch.16 - Aqueous Equilibrium WorksheetSee all chapters
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Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: 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

Solution: 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

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)

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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