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: Amino acids [general formula NH 2CH(R)COOH] can be considered polyprotic acids. In many cases, the R group contains additional amine and carboxyl groups.(a) Can an amino acid dissolved in pure water have a protonated COOH group and an unprotonated NH2 group (Ka of COOH group = 4.47 × 10−3; Kb of NH2 group = 6.03 × 10−5)? Use glycine, NH2CH2COOH, to explain why.

Problem

Amino acids [general formula NH 2CH(R)COOH] can be considered polyprotic acids. In many cases, the R group contains additional amine and carboxyl groups.

(a) Can an amino acid dissolved in pure water have a protonated COOH group and an unprotonated NH2 group (Ka of COOH group = 4.47 × 10−3; Kb of NH2 group = 6.03 × 10−5)? Use glycine, NH2CH2COOH, to explain why.