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Chemistry
Topic 4 - Chemical changes (P1)
Strong and weak acids
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Teona Bate
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How do you know when an acid is a strong acid?
When an acid is dissolved in water and it completely ionises (
fully dissociates
)
How do you when an acid is weak?
When an acid is dissolved in water and it partially
ionises
( partially
disassociates
)
Example of weak acid :
CH3COOH
<-> CH3COO + H
Example of strong acid :
HCI
->
H+
+
CI-
As the
pH
decreases by one unit, the concentration of
hydrogen ions
in the solution increases by a
factor of ten
.
For a given concentration of
aqueous
solution, the
stronger
the acid, the lower the
pH
.
