Substances in Common Use
Maharashtra Board · Class 9 · Science
Quick revision notes for Substances in Common Use — Maharashtra Board Class 9 Science. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Important Salts in Daily Life
- Salts are ionic compounds without H⁺ and OH⁻ ions containing one type of cation and anion
- Sea water contains about 80 million tons of salts annually
- Important sea salts: NaCl, MgCl₂, MgSO₄, KCl, CaCO₃, MgBr₂
Sodium Chloride (Common Salt - NaCl)
- Most commonly used salt, gives salty taste to food
- Formed by neutralization: NaOH + HCl → NaCl + H₂O
- Neutral salt with pH = 7
Sodium Bicarbonate (Baking Soda - NaHCO₃)
- Chemical name: Sodium hydrogen carbonate
- White, non-crystalline powder
- Basic in nature (turns red litmus blue)
Bleaching Powder (CaOCl₂)
- Chemical name: Calcium oxychloride
- Yellowish-white solid with strong chlorine odor
- Prepared by: Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O
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