Acids in Daily Life
Acids are chemical compounds that release hydrogen ions (H⁺) in aqueous solutions. They often taste sour, which is why many natural foods containing acids have a tangy flavour.
Examples of Common Acids:
- Acetic Acid: Found in vinegar.
- Lactic Acid: Present in curd.
- Citric Acid: Found in oranges, lemons, limes, and pomegranates.
- Tartaric Acid: Present in tamarind and grapes.
- Ellagic Acid: Found in strawberries, walnuts, pecans, cranberries, and raspberries; linked to reduced risk of depression and anxiety.
- Malic Acid: Present in apples.
- Formic Acid: Found in red ants.
- Oxalic Acid: Present in tomatoes.
- Folic Acid: Found in broccoli, cauliflower, and avocados.
- Ascorbic Acid (Vitamin C): Found in citrus fruits.
Bases in Daily Life
Bases are compounds that release hydroxide ions (OH⁻) in aqueous solutions. They often taste bitter and feel slippery.
Neutralisation in Nature:
- Bee Stings: Acidic in nature; neutralised using an alkali like baking soda.
- Wasp Stings: Alkaline in nature; neutralised using an acid like vinegar.
Types of Acids
- Organic Acids: Found naturally in plants and animals. Examples include acetic acid and lactic acid. Some are also produced artificially.
- Mineral (Inorganic) Acids: Found in the earth’s crust and widely used in laboratories. Examples include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and nitric acid (HNO₃).
Significance of Acids and Bases
Understanding acids and bases is essential because they:
- Explain the sourness or bitterness in foods.
- Help in neutralisation reactions (important in medicine and daily life).
- Form the foundation of laboratory chemistry and industrial processes.
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