ECS meeting replacement · Independent study · Approximately three hours
Solid equilibria
and adsorption
Start with the physical process and constraints, then combine equilibrium relations with inventory balances. Predict, watch the actual Lab demonstrations and repeat the investigations independently.
There is no live class this week because the instructor will attend the ECS meeting. Complete this independent lesson instead. Pause at the named checkpoints, write predictions before watching results, and continue when the specified output is ready. No additional compulsory preparation or follow-up is assigned.
Your approximately three-hour route
Allow 120 minutes for calculation, investigation and reflection plus a 10-minute break. The video page reports the recording’s actual measured duration and its sum with those planned budgets. The schedule below is a nominal study guide, not video timestamps or a measured completion time. Report your actual minutes in feedback.
There are ten work checkpoints and one break. Predictions come before each Lab demonstration. Hand calculations and unseen cases come before their checks.
| Planned study time | Block | Open, do and retain |
|---|---|---|
| 0-25 min | A–B · Processes, constraints and pure-solid solubility | Worksheet p. 1, A1–A3/B1–B2. Pause 8 minutes at slide 4 and 6 at slide 8. Output: process classifications, constraints and one saturated-liquid composition calculation. |
| 25-45 min | C · Finite-inventory GSE calculations | Worksheet p. 2, C1–C3. Pause 10 minutes at slide 13 before the check. Output: capacity, gas/solid amounts, partial and total pressure, and the phase-presence condition. |
| 45-85 min | D · Lab 10 prediction, demonstration and investigation | Worksheet p. 3, D1–D4; guide pp. 1–2. Predict for 5 minutes at slide 15, watch the actual demonstration at slide 16, then rerun for 22 minutes at slide 18. Save three cases, an independent balance and an annotated plot. |
| 85-95 min | Break | Save your work and take a 10-minute break at slide 20. |
| 95-120 min | E–F · Uptake models and closed-vessel predictions | Worksheet p. 4, E1–E3/F1–F3; guide p. 3. Pause 10 minutes at slide 25 and 5 at slide 29. Calculate Henry/Langmuir uptake and predict the new vessel inventory, model change and adsorbent-mass effect. |
| 120-150 min | G · Lab 11 demonstration and investigation | Watch the actual demonstration at slide 30. Worksheet p. 5, G1–G4; guide pp. 3–4. Pause 24 minutes at slide 32. Compare Langmuir/10 g, Henry/10 g and Langmuir/20 g; independently verify gas-plus-adsorbed balances and reopen saved studies. |
| 150-170 min | H · Unseen-case attempt and review | Worksheet p. 6, H1–H4. Use the 20-minute pause at slide 36 before the check. Keep your first attempt, then mark corrections using the separate solutions. |
| 170-180 min | I · Exit ticket, feedback and saved work | Worksheet p. 6, I. Use the existing Session 4 anonymous form at slide 39; include evidence from both Labs and actual study minutes. Submit once; verify the receipt at slide 40. |
Open the exact documents and Labs
Required route
- Narrated lesson
- Interactive slides · Printable slides
- Worksheet · 6 pages, sections A-I
- Lab guide · 4 pages, exact controls and troubleshooting
- Worked solutions · 4 pages; open after your attempt
- Lab 10: Solid equilibria, using GSE in a rigid vessel
- Lab 11: Adsorption equilibrium, using Explore isotherms and the closed vessel
Demonstrations and optional support
- Lab 10 screen demonstration · slide 16. Complete D1 predictions first, then independently rerun D2-D4 at slide 18.
- Lab 11 screen demonstration · slide 30. Complete F1-F3 first, then independently rerun G1-G4 at slide 32.
- Optional background reading · 3 pages
- Optional Session 4 appendix
- Session 4 learning path and evidence checklist
- Offline package. Slides, documents and Labs are included. Video is online or a separate download; response forms require internet.
What you should keep
- Hand calculations: one pure-solid solubility result; gas-solid capacities, phase amounts and pressures; Henry/Langmuir uptake; and gas-plus-adsorbed inventory checks.
- Lab 10: three predictions and three recorded cases at 300 K, 1 L and Psub=10 kPa. Compare volatile inventories 0.010 and 0.002 mol, then add 0.002 mol inert to the smaller inventory. Keep an annotated plot and an independent balance.
- Lab 11: three records at 300 K, 1 L and total adsorbate 0.010 mol: Langmuir/10 g, Henry/10 g and Langmuir/20 g. Keep an annotated isotherm, separate gas and adsorbed amounts, and independently calculated balances.
- Reproducible records: export every completed case and download a separate comparison JSON for each Lab. Import, restore and recalculate one case in each Lab; verify the fresh result. Exporting does not submit work.
- Transfer and corrections: attempt H1-H4 with the new parameters before viewing solutions. Retain the first answers and mark corrections separately.
Keep these distinctions clear
Bulk sublimation and surface adsorption use different equilibrium descriptions. A sublimation-pressure equality applies while the solid phase remains; the finite inventory may leave only undersaturated vapor. Use volatile partial pressure in that condition, not total pressure.
In adsorption, q is absolute uptake per kg of dry adsorbent. The adsorbed amount is mass times uptake. Matching the Henry slope to Langmuir at low pressure does not make their finite-pressure predictions identical. The models do not calculate reaction equilibrium, kinetics or thermal transients.
The known-pressure example on slide 28 requires 0.01400908 mol total at 10 kPa. The Lab 11 investigation instead starts from 0.0100 mol and solves for pressure. Keep those different cases separate.
Finish with the existing Session 4 form
Open the Session 4 exit ticket and feedback
During the 10-minute pause on slide 39, answer the concept question using finite solid inventory and the partial-pressure condition. In the evidence answer, include one Lab 10 comparison and one Lab 11 balance with numerical settings and units.
In the existing feedback text, include your actual study time, whether the pace felt too fast, suitable or too slow, and any step needing more explanation. For example: “Time spent: ___ minutes. Pace: ___. I need more support with ___ because ___.”
Submit once and wait for “Response received.” At slide 40, verify that receipt and save your worksheet, corrections and exports. The form is anonymous and does not identify individual attendance. Do not resubmit just to verify the receipt.
