---
type: "Chapter"
knowledge_type: "chapter"
entity_type: "chapter"
id: "66def82c3f8b4e9e69bda456"
title: "Electrochemistry"
board: "CBSE"
curriculum: "CBSE"
class: "Class 12"
subject: "Chemistry"
book: "Chemistry - I"
chapter: "Electrochemistry"
chapter_slug: "electrochemistry"
canonical_url: "https://www.edzy.ai/cbse-class-12-chemistry-chemistry-i-electrochemistry"
markdown_url: "https://www.edzy.ai/okf/chapter/cbse-class-12-chemistry-chemistry-i-electrochemistry.md"
source_type: "examSubjectBookChapter"
source_id: "66def82c3f8b4e9e69bda456"
source_pdf: "https://edzy-ai.s3.ap-south-1.amazonaws.com/edzy-express-ts/c8c9aa70-8735-411a-9982-d3bf84b7e364.pdf"
source: "Edzy"
version: 1
last_updated: "2026-06-20"
---

# Electrochemistry

Electrochemistry is the study of the production of electricity from energy released during spontaneous chemical reactions and the use of electrical energy to bring about non-spontaneous chemical transformations. The chapter explores key principles, applications, and significance of electrochemistry in both theoretical and practical contexts.

---

## Knowledge Snapshot

| Field | Details |
| :--- | :--- |
| Class | Class 12 |
| Subject | Chemistry |
| Book | Chemistry - I |
| Chapter | Electrochemistry |
| Pages | 31-60 |

---

## Chapter Summary

### Short Summary
Electrochemistry involves converting chemical energy into electrical energy and vice versa, with applications in batteries, fuel cells, and electrolytic processes.

### Detailed Summary
Electrochemistry explores the production of electricity from spontaneous chemical reactions and the use of electrical energy for non-spontaneous reactions. It holds theoretical and practical significance, producing metals, sodium hydroxide, chlorine, and fluorine through electrochemical methods. Batteries and fuel cells convert chemical energy into electrical energy, being widely used in various devices. The discipline aims at energy-efficient and eco-friendly technologies. The chapter covers the differentiation between galvanic and electrolytic cells, the application of the Nernst equation, concepts of conductivity, molar conductivity, and their variations with concentration, along with aspects such as Kohlrausch's law, electrolysis, and the construction of batteries and fuel cells, and the corrosion phenomenon.

---

## Topic-Wise Explanation

### Electrochemical Cells
Electrochemical cells convert chemical energy to electrical energy or vice versa.

### Galvanic Cells
Galvanic cells generate electricity through spontaneous chemical reactions.

### Nernst Equation
The Nernst equation calculates the electromotive force (emf) of galvanic cells.

### Conductance of Electrolytic Solutions
It involves measuring the conductivity of solutions and how it varies with concentration.

### Electrolytic Cells and Electrolysis
Electrolytic cells use electrical energy to drive non-spontaneous reactions.

### Batteries
Batteries store and convert chemical energy into electrical energy.

### Fuel Cells
Fuel cells generate electricity through the electrochemical reaction of fuels.

### Corrosion
Corrosion is an electrochemical process leading to material degradation.

### The Hydrogen Economy
The role of hydrogen in energy conversion and storage is discussed, though not detailed in this chapter.

---

## Core Ideas

| Idea | Explanation |
| :--- | :--- |
| Electrochemical Processes | Involve the interconversion of electrical and chemical energy. |

---

## Key Concepts

| Concept | Meaning |
| :--- | :--- |
| Electrode | A conductor allowing current to enter or leave the electrolyte. |
| Electrolyte | A substance that conducts electricity when dissolved in water. |
| Molar Conductivity | A measure of the conductivity of an ionic solution at infinite dilution. |

---

## Important Points for Revision

* Electrochemistry connects chemical reactions with electricity.
* Galvanic cells operate spontaneously, unlike electrolytic cells.
* The Nernst equation is crucial for calculating cell emf.
* Conductivity and molar conductivity vary with concentration.
* Kohlrausch's law applies at infinite dilution for electrolytic solutions.
* Electrolysis involves the use of current to drive chemical reactions.
* Batteries and fuel cells are key applications of electrochemistry.
* Corrosion is an electrochemical reaction affecting materials.

---

## Vocabulary and Glossary

| Word / Phrase | Meaning |
| :--- | :--- |
| Electrochemistry | The study of chemical processes that involve electricity. |
| Galvanic Cell | A device that converts chemical energy into electrical energy. |
| Electrolysis | The process of using electric current to drive a chemical reaction. |

---

## Practice Questions

### Short Answer Questions

1. Define electrochemistry.
2. Differentiate between galvanic and electrolytic cells.
3. What is the Nernst equation used for?
4. Explain the concept of molar conductivity.
5. What role do batteries play in electrochemistry?

### Long Answer Questions

1. Discuss the significance of electrochemistry in developing eco-friendly technologies.
2. Explain the principles behind the construction of a galvanic cell.
3. Describe the electrolysis process and its applications.
4. Analyze the factors affecting the conductivity of electrolytic solutions.

---

## Related Concepts

| Concept | Description |
| :--- | :--- |
| Energy Efficiency | Importance of reducing energy waste in electrochemical processes. |
| Signal Transmission | Role of electrochemical reactions in neuron communication. |

---

## Source Attribution

| Field | Value |
| :--- | :--- |
| Source | Edzy |
| Reference Type | examSubjectBookChapter |
| Reference ID | 66def82c3f8b4e9e69bda456 |
| Canonical URL | https://www.edzy.ai/cbse-class-12-chemistry-chemistry-i-electrochemistry |
| Markdown URL | https://www.edzy.ai/okf/chapter/cbse-class-12-chemistry-chemistry-i-electrochemistry.md |