LessonnotesGH

SHS2 Chemistry · Semester 2, Week 1

Equilibria

Lesson notes

Learning Objectives

Indicator: 2.1.2.LI.5 - Determine the quantity of analyte in a solution using acid-base titration.

By the end of the lesson, learners can:

  1. Define titration, analyte, titrant, standard solution, and equivalence point in their own words with correct scientific accuracy.
  2. Perform a simple acid-base titration using a burette, pipette, and conical flask, recording the titre values accurately to two decimal places.
  3. Calculate the concentration of an analyte (in mol/dm³ and g/dm³) from titration data using the mole ratio from the balanced equation.
  4. Determine the percentage purity of an impure sample of an acid or base from titration results.
  5. Determine the percentage of water of crystallization in a hydrated salt using titration data.
  6. Justify the choice of indicator (methyl orange or phenolphthalein) for a given acid-base titration based on the nature of the salt formed.

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Curriculum details

Strand
Physical Chemistry (Strand 1)
Sub-strand
Equilibria (1.2)
Content standard
2.1.2.CS.2 - Demonstrate knowledge and understanding of the concepts and properties of acids and bases to classify substances as well as determine concentration of analysis through titration. 2.1.2.LO.1 Explain that dynamic equilibrium is attained when the rates of the forward and backward reactions are equal and this principle has industrial applications. 2.1.2.LO.2 Apply your knowledge in acids and bases to classify and describe substances as acids and bases as well as determine the concentration of analyte through titration.
Indicator
2.1.2.LI.5 - Determine the quantity of analyte in a solution using acid-base titration.
Suggested placement
Semester 2, Week 1 (Week 21 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. 73

Exemplars (from the NaCCA curriculum) 

Exploratory Learning: Perform titrations and use the data obtained to determine the concentration of an analyte in a solution. The titrations include: a. Simple acid-base titrations for determining percentage purity, percentage of water of crystallization in a hydrated salt, relative atomic mass. b. Back or Indirect titration. c. Double-indicator titration.
Teaching and Learning Materials:
- * Worksheets with illustrative examples of Arrhenius,
- Bronsted-Lowry and Lewis acids and bases for
- Learners to identify * Fruits * Vegetables * Common acids (HCl, HNO , H SO CH COOH,
- H CO , 2 3 * Bases * Universal indicator with pH colour chart * Litmus papers * Ammonium compound (e.g., ammonium chloride) * Bases: NaOH(aq), KOH(aq), Ca(OH) , NH * Zinc chips, iron filings, magnesium ribbon * pH meter * A simple electric circuit with electric bulb/ lamp, beakers, wire, key/switch
- 3 2 4, 3
- 2 3
- * Mixture of Na CO and * Methyl orange and phenolphthalein
- Burette * Pipette * Conical flask * Droppers * Retort stand and clamp * Pipette filler * White tile * Wash bottle with distilled * Calculator
- NaHCO ) 2 3 3 indicators
- water
Assessment (2.1.2.AS.5). The document marks these depth-of-knowledge levels for this indicator: Level 4 Extended critical thinking and reasoning.
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