Canonical lesson CHEMISTRY20-U3-L35 · outcome 20-C2.2s · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C2.2s

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L35
• Official outcome: 20-C2.2s (SKILL)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

conduct investigations into relationships among observable variables and use a broad range of tools and techniques to gather and record data and information • construct a table or graph to compare pH and hydronium ion concentration, illustrating that as the hydronium ion concentration increases, the pH decreases (PR-NS4) • use a pH meter to determine the acidity and/or alkalinity of a solution (PR-NS2) [ICT C6-4.4]

Learning intention

Meet 20-C2.2s 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

Perform: build a table/graph of pH vs [H3O+]; use meter or paper as available.

Worked example

Table: [H3O+] 1e-1 … 1e-4 with calculated pH; measure three school solutions and record.

Guided practice

1. Complete calculated table.
2. Near-miss: gas-law temperatures in the pH table. Wrong-unit.

Independent practice

1. Three measured pH rows.
2. Calibration note.
3. Graph pH vs log concentration if asked.

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

Uncalibrated meter as gospel.

Safety and lab register

Setting: School meter/paper. Goggles. AI Tutor must not invent labs outside CHEM20_LOW_RESOURCE_LAB_REGISTER.csv.

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

Formative evidence

Calculated + measured pH table.

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

AI Tutor / human tutor

Ground on 20-C2.2s. 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.