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Chapter 6: Problem 52

What happens when current passes through an electrolyte?

Short Answer

Expert verified
Question: Explain the process of electrolysis and the role of anodes and cathodes during the reaction. Answer: Electrolysis is a process in which electrical energy is used to drive a non-spontaneous chemical reaction. When an electric current passes through an electrolyte, the ions migrate towards the electrodes. The electrodes consist of an anode, where the oxidation reaction takes place, and a cathode, where the reduction reaction takes place. The anode is connected to the positive terminal and the cathode is connected to the negative terminal of a power source. During the electrolysis process, cations move towards the cathode and undergo reduction, while anions move towards the anode and undergo oxidation. Products are formed at both the anode and the cathode, depending on the electrolyte and the electrodes used in the process.

Step by step solution

01

Introduction of Electrolysis

Electrolysis is a process in which electrical energy is used to drive a non-spontaneous chemical reaction. When an electric current is passed through an electrolyte (a conducting solution or molten ionic compound), the ions in the electrolyte migrate towards the electrodes where reduction and oxidation reactions occur.
02

Electrode Setup

In electrolysis, there are two electrodes: (1) the anode, where the oxidation reaction takes place, and (2) the cathode, where the reduction reaction takes place. The electrodes are connected to a power source, with the anode being connected to the positive terminal and the cathode being connected to the negative terminal.
03

Ion Migration

When the electric current passes through the electrolyte, the positively charged ions (cations) move towards the cathode, and the negatively charged ions (anions) move towards the anode. The ions are attracted to their respective electrodes due to the difference in charges.
04

Reduction at Cathode

At the cathode, the cations gain electrons from the electrode and undergo reduction. The general equation for the reduction process happening at the cathode is: \[ Cation_n + n e^- \rightarrow Atom \ or \ reduced \ species \] where n is the number of electrons gained.
05

Oxidation at Anode

At the anode, the anions lose electrons to the electrode and undergo oxidation. The general equation for oxidation happening at the anode is: \[ Anion_n - n e^- \rightarrow Atom \ or \ oxidized \ species\] where n is the number of electrons lost.
06

Products of Electrolysis

During the electrolysis process, products are formed at both the anode and the cathode. At the cathode, metal ions or hydrogen ions are usually reduced, while at the anode, non-metal ions or hydroxide ions are oxidized. The type of products formed depends on the electrolyte and the electrodes used in the process. Overall, when current passes through an electrolyte, it leads to the movement of ions, and the reduction and oxidation reactions occur at the respective electrodes, resulting in the formation of new products.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Electrolyte
An electrolyte is a substance that conducts electricity when in a liquid state or dissolved in a solution. It is essential for the process of electrolysis as it allows the flow of current by carrying charged particles or ions.
The ions in an electrolyte can be created by dissolving salt in water or by melting ionic compounds. Once dissolved or melted, these ions become mobile and are free to move within the solution or liquid.
Electrolytes are not only integral to electrolysis but also vital in many biological processes. For example, they help maintain voltage across cell membranes in the human body. Understanding electrolytes is crucial for comprehending how charges are transferred during electrolysis and other processes.
Ion Migration
Ion migration refers to the movement of ions in an electrolyte when exposed to an electric current. Once the electric field is applied, the ions move toward their respective electrodes based on their charge.
Cations, which are positively charged ions, migrate towards the cathode. The cathode is the negatively charged electrode. On the other hand, anions, which are negatively charged ions, move towards the anode, which is positively charged.
The flow of ions is driven by the attraction between opposite charges. This migration is a key part of electrolysis as it allows the necessary reduction and oxidation reactions to occur at the electrodes.
Oxidation and Reduction Reactions
Oxidation and reduction reactions are crucial chemical processes that happen during electrolysis. These reactions occur at the electrodes and involve the transfer of electrons.
  • Reduction takes place at the cathode. Here, cations gain electrons. For instance, if metal ions are present, they might gain enough electrons to form a solid metal.
  • Oxidation occurs at the anode. In this process, anions lose electrons. An example is how chloride ions can lose electrons to form chlorine gas.
These reactions are collectively known as redox reactions. Redox reactions are fundamental to electrolysis as they enable the transformation of reactants into different chemical products.
Electrodes in Electrolysis
Electrodes play a central role in the electrolysis process. They are conductive surfaces where the oxidation and reduction reactions occur. There are two types of electrodes in electrolysis:
  • The **anode** is connected to the positive terminal of a power source. It attracts anions, resulting in oxidation reactions as these negatively charged ions release their electrons.
  • The **cathode** is linked to the negative terminal. It attracts cations, causing reduction reactions since these positively charged ions gain electrons.
The material used for electrodes can significantly influence the efficiency and products of electrolysis. Good conductors like platinum or graphite are often used as electrodes due to their ability to withstand high temperatures and corrosive environments.

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