Q1
What does Arrhenius theory say about acids?
AThey release H+ ions in water
BThey release OH- ions
CThey have no ions
DThey are always solid
ICSEClass 10 (ICSE)ChemistryCh 3 · Topic 1
Study of Acids, Bases and Salts
Acids, bases, and salts have distinct properties, defined through modern theories like Arrhenius theory, essential in understanding chemical
Core concept
Arrhenius theory defines acids as substances releasing H+ ions in water, and bases as substances releasing OH- ions in water.
How it works
Acids taste sour and turn blue litmus red, while bases taste bitter, feel soapy, and turn red litmus blue.
Why it matters
Salts are formed when acids react with bases (neutralisation), producing salt and water: Acid + Base → Salt + Water.
Key detail
Understanding pH scale (0-14) helps quantify acidity or basicity, with 7 being neutral, below 7 acidic, and above 7 basic/alkaline.
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Quick notes
• Arrhenius: acids release H+ ions in water.
• Bases release OH- ions in water.
• Acids taste sour, turn blue litmus red.
• Bases taste bitter, turn red litmus blue.
• Neutralisation: Acid + Base → Salt + Water.
• pH scale ranges 0-14.
• 7 is neutral; below 7 acidic; above 7 basic.
• pH quantifies acidity or basicity.