CHEM 125LChemical Reaction Laboratory 2
- Units
- 0.25
- Faculty
- Science
- Subject
- Chemistry
When it runs
- F24
- W25
- S25
- F25
- W26
- S26
- F26
- W27
- S27
Ran in 2 of the last 7 terms. Winter 2027: scheduled. Spring 2027: schedule not out yet.
Selected experiments for student taking CHEM 125. This course is a continuation of CHEM 121L, with increased emphasis on assessment of experimental design.
Prerequisites
- Must have completed the following:
- CHEM121L - Chemical Reaction Laboratory 1 (0.25)
Corequisites
- Completed or concurrently enrolled in:
- CHEM125 - Chemical Reactions, Equilibria and Kinetics (0.50)
Antirequisites
- Not completed nor concurrently enrolled in any of the following:
- CHEM123L - General Chemistry Laboratory 2 (0.25)
Leads to
Winter 2027 sections
| Section | Class | Enrolled | Meets |
|---|---|---|---|
| LAB 001 | 6940 | 0 / 120 | Jan 14 14:30–17:20 Jan 28 14:30–17:20 Feb 11 14:30–17:20 Mar 4 14:30–17:20 Mar 18 14:30–17:20 Apr 1 14:30–17:20 |
| LAB 002 | 6941 | 0 / 120 | Jan 21 14:30–17:20 Feb 4 14:30–17:20 Feb 25 14:30–17:20 Mar 11 14:30–17:20 Mar 25 14:30–17:20 Apr 8 14:30–17:20 |
| LAB 701 | 2600 | 171 / 9999 | Online or by arrangement |
Reviewed on UW Flow
92% liked it68% easy93% useful
From 38 ratings and 5 comments on UW Flow. The most helpful comments, quoted as written, without names. Read them all on UW Flow.
Compared to chem 121L, it's a little harder but the experiments are still pretty straightforward. You may not like all of them but they're all good learning opportunities. There's a lot of graphing in the post-lab reports that'll get super time consuming and annoying. Do not leave things to the last minute! There's a practical exam that's not too bad, you just have to decide what to do on your own. There's also a written exam and that can be tough since you have to know the experiments really really well.
Apr 2026 · liked itOn UW FlowRemove this
A good lab course, on par with CHEM 120/121L. Consider this a part 2 to that course, as the experiments are of a similar difficulty and all the pre/post-lab stuff is handled the same. Sue's a great prof and is much easier to get a hold of than any other lab professor I've had, and all my TA's were great too. This course has a practical exam, make sure you pay attention to the details (unlike myself) so you don't screw up, and ensure you know how to tackle the different scenarios. The written final is fair and you can do very well on it if you understand the labs as well as basic lab safety.
Feb 2025 · liked itOn UW FlowRemove this
kind of got bamboozled on the written final but the labs were super fun and I found the reports easier than 121L. super amazing TA and co-op student made the experience very enjoyable!
make sure to properly prepare for the practical final, it's not too bad at all.Apr 2024 · liked itOn UW FlowRemove this
This lab was super informative and the techniques that are taught will be useful in future lab settings. The lab reports do take some time and effort but they are good practice for making relevant calculations and analyzing data. There is a practical lab exam component for this course which was intimidating at first but with some review is completely doable and fun, it makes you feel like a real scientist.
Apr 2023 · liked itOn UW FlowRemove this
Lab started on the first day of W23 classes for my section. These labs are essentially all titrations of some form, so make sure you know how to do those. Well-managed, lab instructions are clear, no formal lab report as compared to CHEM121L, only modified formal reports. Calculations are great for practicing parts of CHEM125. As always, reports are the worst part. Included a lab exam, which is just a lab task + calculations, but it can be easy as long as you get lucky with your task. Good course.
Apr 2023 · liked itOn UW FlowRemove this
Discussed on r/uwaterloo
5 posts and comments in 5 threads mention CHEM 125L, December 2021 to December 2024. Quoted word for word, newest first; each reply sits under the post and the comment that started its branch. Search r/uwaterloo for newer posts.
Winter 2024
Are all labs cancelled first week 7 points, 4 comments
“I literally have a lab Monday morning after my first class, is it gonna get cancelled?”
u/Picolloo: “Usually course dependent, your instructor might email you before the lab takes place (E.g CHEM 125L, last year the instructor emailed students about tasks that needed to be done before the lab which was on the first day of term). …”
Fall 2023
What is the first day of CHEM120L like? 1 point, 1 comment
“I'm a first year biomed student and I have my first chem lab tomorrow afternoon. I'm reading over everything on LEARN and I was wondering if we are going to be doing an actual lab or is the prof …”
u/Sad-boi-hourz: “… But I also think that when I took Chem120L it was online so I might be thinking of Chem125L”
Winter 2023
48 Hour Leave 12 points, 1 comment
u/Asterion1s: “… i feel extremely burnt-out and i have a lab report due tmrw (chem 125L), as well as a math quiz (math 127). does anyone know how this would work? would i get the percentages redistributed to other assignments/quizzes or just be marked as a zero? …”
Winter 2022
Discords for Chem 140, Chem 125/125L, Biol 239, Math 128, AHS 105, Phys 112 0 points, 1 comment
u/quenty12r: “Is there discords for any of these”
Fall 2021
CS452 in-person from Jan 5th 177 points, 31 comments
u/Dimtar_: “similar thing happening for for CHEM 123L (and i’m assuming CHEM 125L) except we are divided into cohorts where half of us do a lab for the first two weeks and the others do it for the second two”
Check it elsewhere for Fall 2026
- Undergraduate Calendar, 2026–27The official entry
- Requirements for Fall 2026Waterloo’s requisite checker
- Schedule of Classes, Fall 2026Instructors, rooms, live seats
- Quest Class SearchWhere you enrol
- Course outlinesSyllabi from past terms (UW login)
- UW FlowStudent ratings and reviews
- WClassesPast sections back to 2004, and who taught them