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: A 0.229-g sample of an unknown monoprotic acid was titrated with 0.112 M NaOH and the resulting titration curve is shown  in the figure.Determine the molar mass of the acid.A graph of pH versus Volume of base added (mL). At 0 mL of base the pH starts out at about 2 then steadily increases as base is added. At about 25 mL of base added the graph is almost vertical from a pH of about 5 to 11. As more base is added past 25 mL the pH goes back to a steady increase up to 60 mL where the pH is about 13.

Solution: A 0.229-g sample of an unknown monoprotic acid was titrated with 0.112 M NaOH and the resulting titration curve is shown  in the figure.Determine the molar mass of the acid.

Problem

A 0.229-g sample of an unknown monoprotic acid was titrated with 0.112 M NaOH and the resulting titration curve is shown  in the figure.

Determine the molar mass of the acid.

A graph of pH versus Volume of base added (mL). At 0 mL of base the pH starts out at about 2 then steadily increases as base is added. At about 25 mL of base added the graph is almost vertical from a pH of about 5 to 11. As more base is added past 25 mL the pH goes back to a steady increase up to 60 mL where the pH is about 13.

Solution

We’re being asked to calculate the molar mass of an unknown acid based on our interpretation of the titration curve


Recall that at the equivalence point of a titration:


moles acid=moles base


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