- Acids are sour, corrosive substances with pH < 7.
- Bases (alkalis) are bitter, soapy substances with pH > 7.
- Neutral substances (like distilled water) have a pH of 7.
• pH Scale (0 to 14): Measures the concentration of hydrogen ions. Strong acids (e.g., Battery Acid, pH 0) are near 0; strong bases (e.g., Drain Cleaner, pH 14) are near 14. Common values: Lemon Juice (pH 2), Vinegar (pH 3), Milk (pH 6), Baking Soda (pH 8), Soap (pH 10).
• Key Indicators & Color Changes:
- Litmus Paper: Acid turns blue to red; Base turns red to blue.
- Turmeric (Natural): Remains yellow in acid; turns reddish-brown in base.
- Phenolphthalein: Colourless in acid; turns pink in base.
- Methyl Orange: Turns red in acid; turns yellow in base.
• Insect Stings & Neutralization:
- Ant, Bee, Caterpillar: Inject acidic Formic Acid
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