OCR Chemistry Acids & Bases Revision Notes
Master OCR Chemistry Acids & Bases using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Acids and bases are fundamental concepts in chemistry that describe substances based on their ability to donate or accept protons (H+ ions). Understanding their properties, reactions, and pH scale is crucial for predicting chemical behavior in various contexts.
Key Concepts
- 1Acids donate protons (H+) and have a pH less than 7.
- 2Bases accept protons and have a pH greater than 7.
- 3The pH scale ranges from 0 to 14, with 7 being neutral.
- 4Strong acids and bases completely dissociate in water, while weak acids and bases partially dissociate.
- 5Neutralization reactions occur when an acid reacts with a base to produce salt and water.
Simple Explanation
Acids are substances that can give away hydrogen ions (H+) and usually taste sour, while bases can take in hydrogen ions and often taste bitter. The pH scale helps us measure how acidic or basic a solution is, with lower numbers being more acidic and higher numbers being more basic. When an acid and a base mix, they can neutralize each other, creating a salt and water.
Memory Trick
“Remember 'A-B-C' for Acids are Below 7, Bases are Above 7, and the neutral point is 7.”
Flashcards
What is the pH range for acids?
Tap to reveal answer
Exam Questions
Describe and explain the process of neutralization between an acid and a base. [6 marks]
6 marksView mark scheme hint▾
Include definitions of acids and bases, the general reaction, and products formed.
Explain how the pH scale is used to classify substances as acids or bases. [4 marks]
4 marksView mark scheme hint▾
Discuss the pH range for acids and bases and what neutral means.
What is meant by a strong acid? [2 marks]
2 marksView mark scheme hint▾
Define strong acid and mention dissociation in water.
Practice Quiz
What is the pH of a strong acid?
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