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
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
