A2 Unit F325 - Equilibria, Energetics and Elements
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OCR A Level Chemistry A
summary notes on acids, bases, pH, buffers and titration curves (chapters 20-21 on the kerboodle textbook) for module 5 revision.
diagrams and example calculations included
OCR A-Level Chemistry AS Organic Chemistry (Module 4) Summary
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A2 Unit F325 - Equilibria, Energetics and Elements
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OCR-A
MODULE 5
ACIDS & BASES
CHEMISTRY
___
Notes
Types of acids
Monoprotic: release 1 H+ ion per molecule
Diprotic: release 2 H+ ions per molecule
Conjugate acid-base pairs
, HA + H₂O ⇌ A⁺ + H₃O⁺
B + H₂O ⇌ BH⁺ + OH-
pH of strong acids
Logarithmic scale
Change in 1 pH number = x10 difference in [H⁺]
Dilution
Q) 100 cm³ added to 50 cm³ of O.1 mol dm-3
O.1 x (50/150) = 0.03
-log (0.03) = 1.48
Q) 250 cm³ of 0.3 mol dm-3
0.3 x (250/1000) = 0.075
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