Ch.16 - Aqueous Equilibrium WorksheetSee all chapters
All Chapters
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: Pyradine (C6H5N) is a weak organic base with a K b of 1.7x10-9. Suppose you were to titrate 25.0 mL of a 0.100 M aqueous solution of pyridine with a 0.100 M HCl solution.  a. What is the pH at the equivalence point?                       b. The Ka of the acid-base indicator 2,3-dinitrophenol is around 6.69 x 10 -5, and the Ka of the acid-base indicator thymolphthalein is approximately 1.26x10-10. If you had to choose between these two indicators for your titration above, which would you choose?      

Problem

Pyradine (C6H5N) is a weak organic base with a K b of 1.7x10-9. Suppose you were to titrate 25.0 mL of a 0.100 M aqueous solution of pyridine with a 0.100 M HCl solution. 

a. What is the pH at the equivalence point?

 

 

 

 

 

 

 

 

 

 

 

b. The Ka of the acid-base indicator 2,3-dinitrophenol is around 6.69 x 10 -5, and the Ka of the acid-base indicator thymolphthalein is approximately 1.26x10-10. If you had to choose between these two indicators for your titration above, which would you choose?