Ch.18 - ElectrochemistryWorksheetSee 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: When a solution containing M(NO3)2 of an unknown metal M is electrolyzed, it takes 74.1 s for a current of 2.00 A to plate out 0.0737 g of the metal. The metal isa. Cub. Znc. Mnd. Moe. Pd

Problem

When a solution containing M(NO3)2 of an unknown metal M is electrolyzed, it takes 74.1 s for a current of 2.00 A to plate out 0.0737 g of the metal. The metal is

a. Cu

b. Zn

c. Mn

d. Mo

e. Pd

Solution

For this problem, we are being asked to identify the metal present in M(NO3)2 when it takes 74.1 s at 2.0 A to electrolyze a 0.0737 g of the sample


In this case, we need to find the moles of metal using the Faraday's constant. Then divide the mass of metal to determine the molar mass.


The molar mass will tell us the identity of the metal.


Notice that M(NO3)2 dissociates as:


M(NO3)(aq)  M2+ (aq) + 2 NO3(aq)


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