Search found 68 matches

by labbassistant
14 Mar 2023, 13:00
Forum: Sourcing Materials & Eq Repairs
Topic: trundle wheel
Replies: 13
Views: 1911

Re: trundle wheel

We bought 2 from science supply aus 2 years ago and they are both still good, in 2021 they were $34.95ea. Not sure how much they are today
by labbassistant
09 Mar 2023, 08:09
Forum: Safety with Chemicals
Topic: Environmental friendly Disposable Gloves?
Replies: 20
Views: 2742

Re: Environmental friendly Disposable Gloves?

I got this email this morning
by labbassistant
27 Feb 2023, 10:56
Forum: Safety with Chemicals
Topic: printers
Replies: 9
Views: 1500

Re: printers

We have a printer in our prep room. We get our ink and paper from the print room. As far as I know it comes from the school budget. I've never had to purchase or ask if it comes out of our budget.
by labbassistant
24 Feb 2023, 09:54
Forum: Chemistry and Labware - General
Topic: standardized NaOH
Replies: 20
Views: 6781

Re: standardized NaOH

Thanks so much!! I spoke to the chem teacher too and they clarified it too.
by labbassistant
23 Feb 2023, 09:46
Forum: Biology, Physics...
Topic: Year 12 Biology Depth Studies
Replies: 11
Views: 10095

Re: Year 12 Biology Depth Studies

I had a teacher come asking for us to buy a non-pathogenic bacteria for a students depth study. Does anyone know where I could buy a sample of something like this?
Thanks!
by labbassistant
23 Feb 2023, 07:41
Forum: Chemistry and Labware - General
Topic: standardized NaOH
Replies: 20
Views: 6781

Re: standardized NaOH

Hi all, Can someone explain making a primary standard to me? I do not understand this at all. We have some made up from the previous labbie but she retired and I'll need to make more. We used 0.1m oxalic as the primary standard and 0.1 NaOH (unknown conc to the students), but do I just make up 0.1m ...
by labbassistant
22 Feb 2023, 06:53
Forum: Safety with Chemicals
Topic: Risk Assessment
Replies: 7
Views: 1373

Re: Risk Assessment

I'm not sure if this is necessarily valid anymore since CSIS is 20 years old, but I found this in our hard copy of appendix D
by labbassistant
17 Feb 2023, 06:53
Forum: Chemistry and Labware - General
Topic: Sodium Dichromate for cleaning glassware
Replies: 23
Views: 7573

Re: Sodium Dichromate for cleaning glassware

We use 10% oxalic acid for cleaning glassware, could give it a go, not sure if it will work if it's been etched though...
by labbassistant
03 Feb 2023, 13:39
Forum: Safety with Chemicals
Topic: Sodium Metal
Replies: 5
Views: 1338

Re: Sodium Metal

Here is the CSIS for sodium :)
by labbassistant
12 Dec 2022, 11:50
Forum: Recipes and Pracs
Topic: Ammonium hydroxide solution
Replies: 7
Views: 4405

Re: Ammonium hydroxide solution

Hi all, I'm a little confused with ammonia... We have some droppers labelled Ammonia solution 0.1m, and then we have ammonium hydroxide solution 0.1m. I was having a google and I'm not 100% sure but is ammonia the same as ammonium hydroxide? Or is ammonia the gas and ammonium hydroxide the solution...
by labbassistant
12 Dec 2022, 08:39
Forum: Recipes and Pracs
Topic: Ammonium hydroxide solution
Replies: 7
Views: 4405

Re: Ammonium hydroxide solution

Hi all, I'm a little confused with ammonia... We have some droppers labelled Ammonia solution 0.1m, and then we have ammonium hydroxide solution 0.1m. I was having a google and I'm not 100% sure but is ammonia the same as ammonium hydroxide? Or is ammonia the gas and ammonium hydroxide the solution?...
by labbassistant
08 Dec 2022, 12:32
Forum: Chemistry and Labware - General
Topic: White crystal around sodium hydroxide solution bottles
Replies: 14
Views: 4422

Re: White crystal around sodium hydroxide solution bottles

That happened to us too with sodium hydroxide and HCl, both quite strong concentrations around 8M. I just did as suggested. Had a cloth with water and wiped it away. This was last term and I went to the chemstore and saw it's started to recrystalise again. Continuing jobs....
by labbassistant
24 Nov 2022, 06:56
Forum: Chemistry and Labware - General
Topic: Chemical store Room
Replies: 21
Views: 6867

Re: Chemical store Room

Awesome! Thanks everyone!
by labbassistant
23 Nov 2022, 12:26
Forum: Chemistry and Labware - General
Topic: Chemical store Room
Replies: 21
Views: 6867

Re: Chemical store Room

Hi all!

I've been organising our chemstore and was wondering if anyone else has Iron (II) chloride? It isn't listed in CSIS, and chemwatch has it as class 8 so that's where I'll be storing it, just wanted to confirm with others this is correct? It's not listed? And do you have it in your school?
by labbassistant
23 Nov 2022, 07:27
Forum: Recipes and Pracs
Topic: egg drop
Replies: 4
Views: 1372

Re: egg drop

This is what I've been asked for (minus the polystyrene cups) we replaced with paper cups
by labbassistant
22 Nov 2022, 12:21
Forum: Safety with Chemicals
Topic: Experiment gone wrong
Replies: 28
Views: 4199

Re: Experiment gone wrong

My dad told me about this and the way he described it I thought they had used conc sulfuric acid for the carbon snake experiment !! Turns out it was methylated spirits, bicarb and sand. Where did you read/hear it was metho? I googled the experiment because I could only think of the sulphuric acid o...
by labbassistant
22 Nov 2022, 07:08
Forum: Safety with Chemicals
Topic: Experiment gone wrong
Replies: 28
Views: 4199

Re: Experiment gone wrong

My dad told me about this and the way he described it I thought they had used conc sulfuric acid for the carbon snake experiment !! Turns out it was methylated spirits, bicarb and sand.
by labbassistant
28 Oct 2022, 07:00
Forum: Safety with Chemicals
Topic: waste bottle labels
Replies: 18
Views: 4790

Re: waste bottle labels

Where did you find this out? Are you DoE school? I was having a look at CSIS and I can't find anything that says you can store all metals together (other than heavy metals) but things like silver, copper, lead were separate. And we have SO many waste bottles that if what your saying is correct, will...
by labbassistant
27 Oct 2022, 13:29
Forum: Recipes and Pracs
Topic: Degassed Water
Replies: 1
Views: 1243

Degassed Water

Hi all,

We've been asked to make up degassed water. We've had a quick google and found that it says to simmer for 20 mins and let cool. Our plan is to do this the day before and seal in a bottle where there is no air bubble to 'regas' the water.

Has anyone done this before?

Thanks
by labbassistant
27 Oct 2022, 10:59
Forum: Safety with Chemicals
Topic: waste bottle labels
Replies: 18
Views: 4790

Re: waste bottle labels

We have individual waste bottles, eg, silver, lead, copper etc. We don't have a nitrates waste. If we should have one please let me know!