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Preliminary chemistry

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Module 3 | Water

Focus 4: The concentration of salts in water will vary according to their solubility, and precipitation can occur when the ions of an insoluble salt are in solution together

Lesson 1 | Precipitation reactions

  • Identify some combinations of solutions which will produce precipitates, using solubility data.

  • Construct ionic equations to represent the dissolution and precipitation of ionic compounds in water.

  • Present information in balanced chemical equations and identify the appropriate phase descriptors (s), (l), (g), and (aq) for all chemical species.

  • Perform a first-hand investigation, using micro-techniques, to compare the solubility of appropriate salts in solution through precipitation reactions.

Lesson 2 | Modelling solutions

  • Describe a model that traces the movement of ions when solution and precipitation occur.

  • Identify the dynamic nature of ion movement in a saturated dissolution.

Lesson 3 | Concentration

  • Describe the molarity of a solution as the number of moles of solute per litre of solution using:

    c=\tfrac{n} {V}

  • Carry out simple calculations to describe the concentration of given solutions, given masses of solute and volumes of solution.

  • Explain why different measurements of concentration are important.

  • Calculate mass and concentration relationships in precipitation reactions as they are encountered.

Lesson 4 | Preparing and diluting solutions

  • Perform a first-hand investigation to make solutions to specified volume-to-volume and mass-to-volume specifications and dilute them to specified concentrations
    (cV = constant)

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