Ch.18 - ElectrochemistryWorksheetSee 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: How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 60.0 minutes? Enter your answer with one decimal place and no units.a. 0.3 g b. 16.4 g c. 0.5 g d. 32.8 g e. 65.7 g

Solution: How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 60.0 minutes? Enter your answer with one decimal place and no units.a. 0.3 gb. 16.4

Problem

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 60.0 minutes? Enter your answer with one decimal place and no units.

a. 0.3 g
b. 16.4 g
c. 0.5 g
d. 32.8 g
e. 65.7 g

Solution

We’re being asked to calculate for the time mass of nickel metal plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 60.0 minutes.

NiCl2(aq) is subjected to electrolysis. It will break up in the solution:

NiCl2(aq) → Ni2+(aq) + 2 Cl-(aq)

Nickel metal are plated out:

Ni2+(aq) → Ni(s)        

 Ni2+ needs to gain 2 electrons to become Ni(s):

   Ni2+(aq) + 2 e- → Ni(s)


We can now calculate the mass of Ni(s) plated out.

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