Canonical lesson CHEMISTRY20-U3-L31 · outcome 20-C2.11k · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C2.11k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L31
• Official outcome: 20-C2.11k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

identify monoprotic and polyprotic acids and bases and compare their ionization/dissociation

Learning intention

Meet 20-C2.11k 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

Monoprotic acids donate one proton per formula (HCl, CH3COOH). Polyprotic can donate more than one (H2SO4, H3PO4, H2CO3). Bases: NaOH monoprotic in the OH− sense (one OH− per formula); Ca(OH)2 can supply two OH−. Ionization of polyprotic acids is stepwise; the first step of H2SO4 is strong, later steps weaker - Chem 20 compares qualitatively.

Worked example

H3PO4 can lose three H+ in three steps. H2SO4 first ionization is complete in water; HSO4− is weaker. Do not write one-step 3 H3O+ from H3PO4 as if all steps were equally complete.

Guided practice

1. Write the three ionization steps of H3PO4 and why you must not dump 3 H3O+ in one complete step.
2. Near-miss: H2SO4 both protons treated as equally complete in water. Qualify first vs second.

Independent practice

1. HCl vs H2CO3: mono vs poly.
2. Two sentences: stepwise ionization.
3. A diprotic base example: CO32− qualitative.

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

Treating H2SO4 as always giving 2.0 mol H3O+ per mol in every dilute case without the stepwise caveat.

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

H3PO4 steps listed; one warning about one-step 3 H+.

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

AI Tutor / human tutor

Ground on 20-C2.11k. 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.