[Prep Lab Students] Autumn 2025- Week 11

[Weaver, Tyler]

The Weekly Mix
Volume: Autumn 2025 | Edition: Week 11
Schedule

Somehow it’s already the first week of November! Here’s what we’ve got planned:

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Experimental Details

Review the window notes and any associated equipment guides for additional details. Please see the Week 10 Edition<https://lists.osu.edu/pipermail/preplabstudents/2025-October/000311.html> for details on EMS and SST.

SGR

The TAs will pick up candies from the lab support window, these will be on the unknown shelf. Students will need to use the carboy of distilled water in the lab for this one. If the students need to re-smash their candies, they can do so by gently tapping the candy with an iron ring while the candy is resting on a silicone trivet. Be prepared to pass out replacement 50-mL volumetric flasks.

QUL

We’re expecting to go through more than 25,000 microcentrifuge tubes this week. All rooms have a significant stash of 1.7 mL microcentrifuge tubes behind their marker boards. The students will be using the centrifuges for this- if they report one is not working, check the following: it’s plugged in, turned on, and the lid is fully closed. If it still doesn’t work, trade it with one of the extras in the window. Place a broken item sticker on the faulty unit. When doing cart checks for this experiment, swap the entire bin of reagents regardless of fill level. Do not check individual bottles- it takes too long.

WST

If a lab indicates they don’t have enough meters and probes, be sure they are planning to work in pairs. pH meters, probes, and cables to connect the two, are on the bench closest to Hood A.

There could be a few rooms with old (black cable) probes, most rooms will have new (white wire) probes. The probes with the black cables will need to be attached to the top of the meters whereas the new white wire probes will need to be attached to the probe and meter via the white wire.

Connections are made on the top of the meter by pushing and turning (BNC type). Both pH probe types will have either a black o-ring or blue rubber piece at the top of the probe shaft to cushion it from the glass storage tube and help seal in the storage solution. These should stay at the top of the probes while the students are taking readings.

If a student claims their pH meter is “broken”, they should have their TA try to calibrate it before bringing it to the window for an exchange. Emma has prepared a guide on how to handle pH meter issues, please review it. It will be available in the window.

XUF Day 2

We will be moving a large instrument into Hood A of 350. A tank of acetylene will also be clamped to the bench near this hood. While the instrument is in this hood, the orange bucket will temporarily be placed under Hood A.

SYN Day 2

Be prepared to direct students to the ice machine outside of the restrooms. There is no scoop provided; students should just use an empty beaker from their drawer. Extra white pea size stir bars and vacuum tubing will be available in the window. Concentrated phosphoric acid is used for Day 2 and will be provided in Hood A. Each room will have a microscope. We will snag a tiny amount of sample from the first group to obtain crude product to put under the microscope. If the microscope says it’s not connected, you need to go into the tablet wifi settings and connect to the option that starts with M. If it asks for a password, it’s just 12345678. Any questions you cannot answer should be directed to me.

Other Information
One-A-Days

Beginning this week, we will be more attentive to students that are not completing one-a-days when they should. The list on the board has been lacking, even on the days we actually had one-a-days. Please be sure you are completing your obligations.
General Chemistry Prep Lab • Department of Chemistry and Biochemistry • THE Ohio State University
preplabstaff at lists.osu.edu<mailto:preplabstaff at lists.osu.edu>

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