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
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Identify some combinations of solutions which will produce precipitates, using solubility data.
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Construct ionic equations to represent the dissolution and precipitation of ionic compounds in water.
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Present information in balanced chemical equations and identify the appropriate phase descriptors (s), (l), (g), and (aq) for all chemical species.
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Perform a first-hand investigation, using micro-techniques, to compare the solubility of appropriate salts in solution through precipitation reactions.
Lesson 2 | Modelling solutions
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Describe a model that traces the movement of ions when solution and precipitation occur.
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Identify the dynamic nature of ion movement in a saturated dissolution.
Lesson 3 | Concentration
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Describe the molarity of a solution as the number of moles of solute per litre of solution using:
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Carry out simple calculations to describe the concentration of given solutions, given masses of solute and volumes of solution.
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Explain why different measurements of concentration are important.
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Calculate mass and concentration relationships in precipitation reactions as they are encountered.
Lesson 4 | Preparing and diluting solutions
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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)
