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SAI International School
Class-X

Subject_ Chemistry
Topic- Acids, Bases & Salts
Sub Topic- pH of Acids & Bases

LESSON NOTES

 [pH] OR Potenz of Hydrogen ion Concentration in a Solution-

 pH stands for potential of hydrogen with-

• “p” meaning potential and
• “H” standing for hydrogen

 pH is a measure ofhydrogen ion concentrationin a solution,

ie. a measure of-
+
 acidity [conc. of H ions]
or
-
 alkalinity [conc. of (OH) ions] of a solution.

 An aqueous solution may be –
a. Neutral
b. Acidic
c. Basic
Depending on the concentration of H+ ion.

 In a neutral solution,
+ +
The concentration of H ions{represented as [H ]} is equal to the
- -
concentration of (OH) ions {represented as [OH ]}
+ -
Hence in a neutral solution, [H ] = [OH ]
 In an acidic solution,
+ +
The concentration of H ions {represented as [H ]} is more than the
- -
concentration of (OH) ions {represented as [OH ]}
+ -
Hence in an acidicsolution,[H ] > [OH ]

 In abasic solution,

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