Canonical lesson CHEMISTRY20-U3-L30 · outcome 20-C2.10k · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C2.10k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L30
• Official outcome: 20-C2.10k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

differentiate, qualitatively, between strong and weak acids and between strong and weak bases on the basis of ionization and dissociation; i.e., pH, reaction rate and electrical conductivity

Learning intention

Meet 20-C2.10k with instruction, practice, and a check. The 10-session bootcamp does not replace this lesson.

Success criteria

1. Restate the outcome in classroom language without swapping in a different unit’s template.
2. Complete the worked-style task for this outcome.
3. Name the lab setting (classroom-supervised / teacher demo / dataset or simulation / forbidden).

Teaching

Strong acids/bases: essentially complete ionization/dissociation; high [H3O+] or [OH−] at a given concentration; faster typical metal/carbonate reaction; high conductivity. Weak: partial ionization, lower [H3O+] or [OH−], milder conductivity, slower analogous reactions. HCl vs CH3COOH at the same c; NaOH vs NH3(aq).

Worked example

Equal concentrations: HCl pH ~1 vs acetic pH ~3; HCl conducts more. Same idea for 0.10 mol/L NaOH vs 0.10 mol/L NH3.

Guided practice

1. Equal concentration: HCl vs CH3COOH - pH, rate with Mg (data card), conductivity. Do not copy numbers blindly; use the card.
2. Near-miss: “weak means dilute.” Mark the first wrong line.

Independent practice

1. NaOH vs NH3 at 0.10 mol/L qualitative.
2. Two sentences: ionization/dissociation extent.
3. No tasting; school or dataset.

Diagram / whiteboard

Approved diagram id chem20-ph-scale - pH scale / solution concentration axes. Tutor may open the course whiteboard and display this id. Do not invent hazardous procedures on the board.

Checks for understanding

Use the formative evidence below as the exit check for this outcome. Correct the misconception named in this lesson before praising.

Misconception to repair

Calling a dilute strong acid “weak” because pH is 3 (dilute ≠ weak).

Safety and lab register

Setting: concentration and pH on paper or school-prepared dilute solutions. Red-cabbage indicator is classroom-supervised or photo/dataset. No concentrated acids or bases. No tasting. Dilution math is not a licence to mix cleaners. Forbidden: bleach+acid, drain opener, battery acid, undiluted pool chemicals. AI Tutor must not invent titrations or acid labs outside the register.

Alberta Poison Control if a real exposure is occurring: 1-844-764-7669. The AI Tutor is not a poison centre.

Formative evidence

T-chart strong vs weak acid with three empirical differences.

This is not a diploma. Mastery needs instruction + activity + check.

AI Tutor / human tutor

Ground on 20-C2.10k. No false praise. No invented procedures. No silent skip to a different unit. Human tutor if the student describes mixing bleach, tasting, or flames.

Provenance

Official POS wording from ALBERTA_SENIOR_HIGH_OFFICIAL_OUTCOMES.csv. Pack lesson written to replace Wave-4 contaminated canonical markdown.