Skip to main content
Ch.19 - Electrochemistry
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 4th EditionCh.19 - ElectrochemistryProblema 98
Capitolo 19, Problema 98

How can one sketch an electrolysis cell that electroplates nickel onto other metal surfaces, labeling the anode and cathode and indicating the reactions that occur at each?

Guida verificata passo dopo passo
1
Identify the components of the electrolysis cell: anode, cathode, electrolyte solution, and power source.
Label the anode as the positive electrode where oxidation occurs, and the cathode as the negative electrode where reduction occurs.
Indicate that the anode is made of nickel, which will dissolve into the electrolyte solution as Ni^2+ ions.
Label the cathode as the metal surface to be plated with nickel, where Ni^2+ ions from the solution will gain electrons and deposit as solid nickel.
Write the half-reactions: at the anode, \( \text{Ni (s)} \rightarrow \text{Ni}^{2+} (aq) + 2e^- \); at the cathode, \( \text{Ni}^{2+} (aq) + 2e^- \rightarrow \text{Ni (s)} \).

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Electrolysis

Electrolysis is a chemical process that uses electrical energy to drive a non-spontaneous reaction. In an electrolysis cell, an external power source applies voltage to facilitate the movement of ions in an electrolyte solution, leading to chemical changes at the electrodes. This process is fundamental in electroplating, where metal ions are deposited onto a surface.
Video consigliato:
Percorso guidato
01:21
The Electrolytic Cell

Anode and Cathode

In an electrolysis cell, the anode is the electrode where oxidation occurs, meaning it loses electrons, while the cathode is where reduction takes place, gaining electrons. For nickel electroplating, the anode typically consists of nickel metal, which dissolves into the solution as nickel ions, while the cathode is the surface being plated, where nickel ions are reduced and deposited.
Video consigliato:
Percorso guidato
00:56
Electrolytic Cell Components Example

Half-Reactions

Half-reactions are the individual oxidation and reduction reactions that occur at the anode and cathode, respectively. In the context of nickel electroplating, the half-reaction at the anode involves the oxidation of nickel metal to nickel ions, while the cathode reaction involves the reduction of nickel ions back to solid nickel. Understanding these half-reactions is crucial for sketching the electrolysis cell accurately.
Video consigliato:
Percorso guidato
07:19
Redox Half Reactions Example
Pratica correlata
Domanda del libro di testo

Silver can be electroplated at the cathode of an electrolysis cell by the half-reaction: Ag+(aq) + e– → Ag(s) What mass of silver would plate onto the cathode if a current of 6.8 A flowed through the cell for 72 min?

2188
views
Domanda del libro di testo

Make a sketch of an electrolysis cell that electroplates copper onto other metal surfaces. Label the anode and the cathode and indicate the reactions that occur at each.

887
views
Domanda del libro di testo

A major source of sodium metal is the electrolysis of molten sodium chloride. What magnitude of current produces 1.0 kg of sodium metal in 1 hour?

1055
views
Domanda del libro di testo

Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of each aqueous solution. b. KCl(aq) c. CuBr2(aq)

Domanda del libro di testo

Write equations for the half-reactions that occur at the anode and cathode for the electrolysis of each aqueous solution. a. Ni(NO3)2(aq)

3029
views