Ch.15 - Acid and Base EquilibriumWorksheetSee 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
Problem

Given the following values of pK, which is the weakest acid of those listed in the answers?

pKb of NH3 = 4.75

pKa of HNO2 = 3.37

pKb of  C5H5NH = 8.75

pKa of  HBrO = 8.69

pKa of  HClO = 7.53

Solution

We are asked to identify the weakest acid given. 


pKa is the negative base-10 logarithm of the acid dissociation constant (Ka) of a solution.

The lower the pKa value, the stronger the acid.


pKb is the negative base-10 logarithm of the base dissociation constant (Kb) of a solution.

The lower the pKb value, the stronger the base or the weaker.


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