Page 1 - 3.LESSON NOTES (CH-2 CONCEPTS OF ACIDS & BASES)
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SAI International School
Class-X
Subject_ Chemistry
Topic- Acids, Bases & Salts
Sub Topic- Concept of Acids & Bases
LESSON NOTES
A. Common Man’s concept of Acids & Bases-
• ACIDs- Acids are substances that are sour to taste and corrosive in
nature.
• Bases- Bases are substances that are bitter to taste and slippery to touch.
B. Arrhenius concept of acids and bases-
• ACIDS- Acids are those substances which liberate H+ (hydronium) ions in
their aqueous medium.
+
HCl + H2O → H3O + Cl -
(Hydronium ion)
• BASES- Bases are those substances which liberate OH- (hydroxyl) ion in
their aqueous medium.
-
+
NaOH + H2O → Na + 2 (OH )
(hydroxyl ion)
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