The Acidic Family of Organic Chemistry
🧪 The Acidic Family of Organic Chemistry
Think of the -COOH group as the 'sourness switch' for molecules! Take a neutral alcohol and transform it by oxidation — suddenly you have an acid that can donate protons, react with metals, and create that familiar sour taste. It's like converting a mild-mannered molecule into a reactive chemical!
The -COOH functional group is the acid-maker. This carboxyl group (C=O + OH combined) gives these compounds their acidic properties, allowing them to donate hydrogen ions in solution. It's the reason vinegar dissolves limescale and why citric acid preserves food!
From ancient preservation techniques using vinegar to modern pharmaceutical manufacturing, carboxylic acids are essential to both nature and technology. They're found in every living cell, preserve our food, and are the building blocks for everything from aspirin to biodegradable plastics.
Chemistry glossary
- What are carboxylic acids?
- Organic compounds containing the -COOH carboxyl functional group
General Formula: CₙH₂ₙ₊₁COOH (or CₙH₂ₙO₂)
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🧠 Memory Aid: -COOH = Acid, -anoic acid Ending
Two simple rules to remember carboxylic acids:
- Functional group = -COOH (carboxyl group)
- Naming = same prefix as alkane + "-anoic acid" ending
Meth-anoic, Eth-anoic, Prop-anoic, But-anoic acid
Test for carboxylic acids: Add sodium carbonate — "If it fizzes, it's an acid". The fizzing is CO₂ being produced.
Oxidation pathway: Alcohol → [oxidise] → Carboxylic Acid. Think: wine (ethanol) + air (oxygen) → vinegar (ethanoic acid). Oxidation goes UP the functional group "ladder".
Now try it yourself
Quiz · Question 1 of 22
What is the functional group present in all carboxylic acids?
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This topic in real past papers
Every real exam question we've found on carboxylic acids, with a full worked answer.