#1 Science Forum For Lab Technicians

Oh and I also did this with metho

Similar topic... but I bought the 20L double strength vinegar from a cleaning supplier a couple of years ago and it's been great! So much cheaper and less waste than buying it from the supermarket in 2L bottles.

How are we going to celebrate?

I got annoyed by the metal ones. I prefer the wooden ones. For most pracs now we use micro test tubes and plastic racks from wiltronics. I have a basket that fits in the dishwasher that i leave on its side and add the test tubes to on their side, and once the test tubes fill the basket I put a gauze ...

Thanks for those links! I will be able to use some of them which is very helpful as a starting point. I forgot to mention it would be a primary school club open to years 2-6, possibly with some yr 9 and 10 agriculture students assisting.

I have found myself in charge of establishing a "sustainability club" which will be starting up next term. Our school already has a worm farm that I have now bought worms for, and I've put a few scrap bins around (staff room, food tech and OOSH for now) and after the holidays we will have larger ...

Yeah we normally do starch in the dialysis tubing and lugol's iodine in the water. The iodine goes in but the starch doesn't come out. The only one group started to turn black.

Does anyone have the prac for glucose osmosis? The one where glucose goes in the tubing and distilled water in the beaker, then test the beaker water for glucose at the end with benedicts solution? The only ones I can find online have the starch and glucose combined (which I will suggest we use for ...

PS bigmack - how did you just happen to work this out??

I originally joined in 2007! hahaha now I feel old...

Next time try soaking them in metho for 24 hours. It firms them up a bit. It's not a perfect solution to the mushiness but it's better than dishing up a pile of goop.

We use them for rates of reaction - surface area. So they do one whole, one in quarters, one completely crushed and they time how long each one takes to dissolve.

Marama T wrote: 23 Feb 2026, 06:42 We use effervescent denture cleaning tablets instead of Alka-Seltzer. Much cheaper.

I tried that and the teachers said the end point was too hard to see

I hadn't thought about it that way !! I might just stick to purchasing

Random Friday morning thought... Has anyone ever considered using a tablet press to make your own "alka-seltzer" tablets for pracs? So instead of spending a small fortune each year on tablets (we've recently discovered the help@hand electrolyte tablets work well which are a bit cheaper) and then ...

I ended up finding them in Kmart $6 for 100pk. It must just be hit and miss when I go looking...

Where do you all buy your balloons in bulk? I'm finding supermarkets are getting so expensive and only 20 balloons at a time.

A mini ripple tank sounds interesting! What a shame you missed the farm talk though...

So, we've just done this one again this year. The teacher did it in beakers but 3 beakers broke in the process... We are now looking into induction hotplates and saucepans. Not just for this one prac, but there have been a few times the teachers have wanted hotplates instead of bunsens for whatever ...

5 years from when it was last "updated" on the actual SDS produced by the manufacturer