Ch.1 - Intro to General ChemistryWorksheetSee 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: Electrodes used in electrocardiography are disposable, and many of them incorporate silver. The metal is deposited in a thin layer on a small plastic “button,” and then some is converted to AgCl:Ag(s)

Problem

Electrodes used in electrocardiography are disposable, and many of them incorporate silver. The metal is deposited in a thin layer on a small plastic “button,” and then some is converted to AgCl:

Ag(s) + Cl(aq) ⇌ AgCl(s) + e

(a) If the surface area of the button is 2.0 cm2 and the thickness of the silver layer is 7.5×10−6 m, calculate the volume (in cm3) of Ag used in one electrode.

(b) The density of silver metal is 10.5 g/cm3. How many grams of silver are used per electrode?

(c) If Ag is plated on the button from an Ag+ solution with a current of 12.0 mA, how many minutes does the plating take?

(d) If bulk silver costs $28.93 per troy ounce (31.10 g), what is the cost (in cents) of the silver in one disposable electrode?