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3.1 Proton transfer reactions

Syllabus
First assessment 2025
Topic
3.1
Level
SL

Objective notes

8 learning objectives
3.1.1Brønsted-Lowry theory

• Acid = proton donor

• Base = proton acceptor

• Deduce acid and base in a reaction; distinguish base and alkali

3.1.2Conjugate acid-base pairs

• Differ by one proton

• Deduce conjugate acid/base formulas

3.1.3Amphiprotic species

• Can act as both acid and base

• Write equations showing acid and base behaviour

3.1.4pH scale

• pH = −log₁₀[H⁺]

• [H⁺] = 10⁻ᵖᴴ

• Calculate pH and [H+]; include universal indicator and pH probe use

3.1.5Ion product of water (Kw)

• Kw = [H⁺][OH⁻]

• Acidic: [H⁺] > [OH⁻]

• Neutral: [H⁺] = [OH⁻]

• Basic: [H⁺] < [OH⁻]

• Recognize acidic, neutral, and basic solutions from [H+] and [OH-]

3.1.6Strong vs. weak acids/bases

• Differ in extent of ionization

• Equilibrium favors weaker conjugate

• Distinguish strong/weak from concentrated/dilute

3.1.7Neutralization reactions

• Acid + metal oxide/hydroxide/carbonate/hydrogencarbonate

• Formulate equations and identify parent acids/bases of salts

3.1.8pH curves

• Strong acid-strong base titrations

• Characteristic shapes

• Sketch and interpret intercept and equivalence point for monoprotic titrations

ConceptIB Chemistry SL