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HSC Chemistry

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2 | Acidic environment

3: Acids occur in many foods, drinks and even within our stomachs

Lesson 1 | Define acids and their ionisations

  • Define acids as proton donors and describe the ionisation of acids in water

  • Identify acids including acetic (ethanoic), citric (2-hydroxypropane-1,2,3-tricarboxylic), hydrochloric and sulfuric acid

  • Use available evidence to model the molecular nature of acids and simulate the ionisation of strong and weak acids

Lesson 2 | pH

  • Identify pH as -log10 [H+] and explain that a change in pH of 1 means a ten-fold change in [H+]

  • Process information from secondary sources to calculate pH of strong acids given appropriate hydrogen ion concentrations

  • Describe the use of the pH scale in comparing acids and bases

Lesson 3 | Modelling ionisation of acids

  • Use available evidence to model the molecular nature of acids and simulate the ionisation of strong and weak acids

Lesson 4 | pH of identical concentrations of strong and weak acids

  • Plan and perform a first-hand investigation to measure the pH of identical concentrations of strong and weak acids

  • Describe acids and their solutions with the appropriate use of the terms strong, weak, concentrated and dilute

  • Compare the relative strengths of equal concentrations of citric, acetic and hydrochloric acids and explain in terms of the degree of ionisation of their molecules

  • Describe the difference between a strong and a weak acid in terms of an equilibrium between the intact molecule and its ions

  • Gather and process information from secondary sources to write ionic equations to represent the ionisation of acids

Lesson 5 | Naturally occurring acids and bases. Use as food additives

  • Identify data, gather and process information from secondary sources to identify examples of naturally occurring acids and bases and their chemical composition

  • Gather and process information from secondary sources to explain the use of acids as food additives

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    Lessons by expert teachers that cover the NSW HSC Chemistry Syllabus comprehensively.

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