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: You are asked to go into the lab and prepare a buffer solution with a pH of 6.40 ± 0.2.  Which weak acid would be the best choice?             A)  carbonic acid                                Ka = 4.2 x 10-7                B)  phenol                                           Ka = 1.3 x 10-10                C)  ascorbic acid                                 Ka = 8.0 x 10-5                D)  hydrosulfuric acid                          Ka = 9.5 x 10-8                E)  potassium hydrogen phthalate      Ka = 3.1 x 10-6    

Problem

You are asked to go into the lab and prepare a buffer solution with a pH of 6.40 ± 0.2.  Which weak acid would be the best choice?

            A)  carbonic acid                                Ka = 4.2 x 10-7   

            B)  phenol                                           Ka = 1.3 x 10-10   

            C)  ascorbic acid                                 Ka = 8.0 x 10-5   

            D)  hydrosulfuric acid                          Ka = 9.5 x 10-8   

            E)  potassium hydrogen phthalate      Ka = 3.1 x 10-6