Canonical lesson CHEMISTRY20-U3-L06 · outcome 20-C1.6k · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C1.6k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L06
• Official outcome: 20-C1.6k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

calculate, from empirical data, the concentration of solutions in moles per litre of solution and determine mass or volume from such concentrations

Learning intention

Meet 20-C1.6k 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

c = n/V with V in litres. n = m/M. Rearrange: n = cV, m = nM, V = n/c. Use solution volume, not solvent volume, unless the question says otherwise.

Worked example

What mass of KCl (M = 74.6 g/mol) is needed for 0.250 L of 0.400 mol/L? n = 0.100 mol, m = 7.46 g. Volume to provide 0.0500 mol from 0.200 mol/L: V = 0.250 L.

Guided practice

1. Mass of Na2CO3 (M = 106.0 g/mol) needed for 0.500 L of 0.150 mol/L. Do not copy the KCl 7.46 g item.
2. Near-miss: using 106 g as if it were already 0.150 mol. Mark the first wrong line.

Independent practice

1. Volume of 0.250 mol/L that contains 0.0400 mol.
2. Two sentences: n = cV and m = nM.
3. Unit check: L vs mL in V.

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

Using mL without converting to L, or using solvent mass as V.

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

Full calculation: mass for a stated c and V.

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

AI Tutor / human tutor

Ground on 20-C1.6k. 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.