In a nickel-cadmium battery (Nicad), cadmium is oxidized to Cd(OH)2 at the anode, while Ni2 O3 i

step 1 Let's start by writing the two things that are happening. So cadmium is going to cadmium hydroxi

In a nickel-cadmium battery (Nicad), cadmium is oxidized to...

In a nickel-cadmium battery (Nicad), cadmium is oxidized to $\mathrm{Cd}(\mathrm{OH})_{2}$ at the anode, while $\mathrm{Ni}_{2} \mathrm{O}_{3}$ is reduced to $\mathrm{Ni}(\mathrm{OH})_{2}$ at the cathode. A portable CD player uses 0.175 amp of current. How many grams of $\mathrm{Cd}$ and $\mathrm{Ni}_{2} \mathrm{O}_{3}$ are consumed when the CD player is used for an hour and a half?

Key Concepts

Molar Mass and Unit Conversions

This concept involves converting between moles and grams using the substance’s molar mass. It is necessary for relating the moles of reduced or oxidized substances, as calculated from the charge passed and the reaction stoichiometry, to the actual mass consumed or produced in a given electrochemical process.

Stoichiometry of Redox Reactions

In redox reactions, electrons are transferred between species, and the stoichiometry of these reactions determines the number of moles of electrons involved per mole of reactant. This concept is crucial for calculating how much of each reactant is consumed or produced based on the total number of electrons transferred during the redox process.

Electric Charge and Current-Time Relationship

This concept involves understanding that electric current is the rate of flow of charge per unit time. By multiplying the current (in amperes) by the duration of time (in seconds), one obtains the total charge that has passed through the system, which is an essential step for applying Faraday’s Law in quantitative analyses.

Faraday's Law of Electrolysis

Faraday's Law establishes that the amount of substance that undergoes oxidation or reduction at an electrode is directly proportional to the total electric charge passed through the electrolyte. This law provides the fundamental relationship between the quantity of electricity (expressed in coulombs), the amount of substance (in moles), and the number of electrons transferred in the chemical reaction.

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