Equilibria · SHS1 Chemistry

Lesson notes

Learning Objectives

Indicator: 1.1.2.LI.2 - Determine the solubility of soluble and sparingly soluble substances.

By the end of the lesson, learners can:

Define solubility in grams per 100 g of water and distinguish between soluble, sparingly soluble, and insoluble substances using given data.
Perform an experiment to determine the solubility of a named salt (e.g., potassium chloride or sodium chloride) at three different temperatures and record accurate measurements.
Plot a solubility curve from experimental data, with temperature on the x-axis and solubility on the y-axis, using proper graph conventions.
Interpret a solubility curve to deduce information such as the effect of temperature on solubility, the approximate solubility at a given temperature, and whether a salt is soluble or sparingly soluble.
Apply solubility data and curves to predict the behaviour of common ionic compounds in qualitative analysis scenarios.

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Curriculum details

Strand: Physical Chemistry (Strand 1)
Sub-strand: Equilibria (1.2)
Content standard: 1.1.2.CS.1 - Demonstrate knowledge and application of solubility and solubility rules. 1.1.2.LO.1 Apply the solubility rules to analyse and predict the behaviour of common ionic compounds in qualitative analysis.
Indicator: 1.1.2.LI.2 - Determine the solubility of soluble and sparingly soluble substances.
Suggested placement: Semester 2, Week 6 (Week 26 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: NaCCA curriculum document, p. 43

Exemplars (from the NaCCA curriculum)

Activity-Based Learning: Perform an experiment to determine the solubility of a named salt at different temperatures.
Collaborative Learning: In groups, analyse a given data on salts and determine their solubilities.
Exploratory Learning:
- Plot a graph of solubility curve using data from experiment.
- Analyse and deduce information from the curve.
Teaching and Learning Materials:
- * Worksheets, * Simulations (PHET), video, virtual laboratory can be used here. * Warm and cold water * Sugar * Common salt * Thermometer * Beaker
- * Tripod stand * *
- Salts containing desired cations or anions, * Test tubes * Wash bottle * * Chart
- Gauze * * Chart Source of heat * Excel sheet
- Graph
- * Distilled water
- Bench solutions, * Dropper
- CHARTS of the solubility rules on the solubility of different salts
Assessment (1.1.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.