Ch.16 - Aqueous Equilibrium WorksheetSee all chapters
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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: Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq)From known initial concentrations of Fe3+(aq) and SCN-(aq), and a spectrophotometric determination of the concentration of FeSCN2+(aq) at equilibrium, calculate Keq fo

Problem

Fe3+(aq) + SCN-(aq) ⇌ FeSCN2+(aq)

From known initial concentrations of Fe3+(aq) and SCN-(aq), and a spectrophotometric determination of the concentration of FeSCN2+(aq) at equilibrium, calculate Keq for this reaction from the following data.

Initial Conditions: Mix 4.24 ml of 2.10 x 10 -3 M Fe(NO3)3(aq) solution with 4.66 ml of 2.50 x 10 -3 M KSCN(aq) solution in a graduated cylinder. Add water so the total volume of the solution is 10.00 ml.

 

 

Equilibrium Conditions: The equilibrium concentration of FeSCN 2+(aq) is found to be 2.27 x 10 -4 M from spectrophotometry.