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

Solution: Predict which member of each pair produces the more acidic aqueous solution?Al3 +  or Ga3 + .

Solution: Predict which member of each pair produces the more acidic aqueous solution?Al3 +  or Ga3 + .

Problem

Predict which member of each pair produces the more acidic aqueous solution?

Al3 +  or Ga3 + .

Solution

We’re asked to predict which ion: Al3+ or Ga3 produces the more acidic aqueous solution.


Recall that when comparing the acidity of cations in solution:


  • The higher the positive charge  more acidic solution 


  • The smaller the cationic radius (ionic size) → more acidic solution 


Since both cations have the same charge, we will compare their ionic radius using periodic trends to determine the smaller cation which produces a more acidic solution. 


Recall that ionic radius is the size of an ion. The trend for ionic radius or size is as follows: it increases from right to left and down a period in the periodic table:

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