Skip to main content
Ch.20 - Electrochemistry
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 6th EditionCh.20 - ElectrochemistryProblema 98
Capitolo 20, Problema 98

What products are obtained in the electrolysis of a molten mixture of KI and KBr?

Guida verificata passo dopo passo
1
Step 1: Understand the process of electrolysis. Electrolysis is a process that uses an electric current to drive a non-spontaneous chemical reaction. In this case, the electrolysis of a molten mixture of KI (potassium iodide) and KBr (potassium bromide) will produce elemental potassium, iodine, and bromine.
Step 2: Identify the ions present in the molten mixture. The molten mixture of KI and KBr will contain K+ ions, I- ions, and Br- ions.
Step 3: Determine the reactions at the electrodes. At the cathode (negative electrode), the K+ ions will gain electrons to form elemental potassium (K). This is a reduction reaction. At the anode (positive electrode), the I- and Br- ions will lose electrons to form elemental iodine (I2) and bromine (Br2). These are oxidation reactions.
Step 4: Write the half-reactions. The half-reaction at the cathode is K+ + e- -> K. The half-reactions at the anode are 2I- -> I2 + 2e- and 2Br- -> Br2 + 2e-.
Step 5: Combine the half-reactions to get the overall reaction. The overall reaction is 2K+ + 2I- + 2Br- -> 2K + I2 + Br2.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
7m

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 this process, an electric current is passed through an electrolyte, causing the decomposition of the compound into its constituent elements or ions. The products formed depend on the nature of the electrolyte and the electrodes used.
Video consigliato:
Percorso guidato
01:21
The Electrolytic Cell

Ionic Compounds

Ionic compounds, such as potassium iodide (KI) and potassium bromide (KBr), consist of positively and negatively charged ions held together by ionic bonds. When molten, these compounds dissociate into their respective ions, allowing them to conduct electricity. The behavior of these ions during electrolysis is crucial for predicting the products formed.
Video consigliato:
Percorso guidato
02:11
Ionic Compounds Naming

Electrode Reactions

During electrolysis, reactions occur at the electrodes: oxidation at the anode and reduction at the cathode. For a molten mixture of KI and KBr, potassium ions (K+) migrate to the cathode to gain electrons, while bromide (Br-) and iodide (I-) ions migrate to the anode to lose electrons. The specific products formed depend on the relative reactivity of the ions involved.
Video consigliato:
Percorso guidato
03:29
Electron Capture & Positron Emission Reaction Example
Pratica correlata
Domanda del libro di testo

Write equations for the half-reactions that occur in the electrolysis of molten potassium bromide.

1527
views
1
rank
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

What products are obtained in the electrolysis of molten NaI?

1416
views
1
comments
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