Australia's Science Forum

Or try Southern Biological - they will sell something.

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...

Legislation states that the PCBU must manage risks - so identifying hazards, rating the risk of those hazards and then taking steps to control the risks. This is done by doing a risk assessment which is prepared by the person undertaking the activity (or in the case with children - the person runnin...

Think that's it. There was some problem a few years ago with these types of mats containing asbestos but any you purchase now would be fine. I've never had any experience with them to know if they last longer, work better etc.

Isn't copper carbonate insoluble in water? If you have some in water, I would filter it out and throw the filter paper in the bin.

Of course I remember you Lada! Lovely to hear from you. Thanks for the tips re. the Chem waste. I always hated Chemistry when I was at school (I liked Physics though!) now I find that Chem is a major part of my job and I am expected to be the "School Chemistry Expert". Funny how things tu...

The solid can be wrapped and put into the bin.

Yep - bin them. Does sound like the NaOH effect, but who knows?

Class A will be more accurate than B. If you are going to the trouble of using a volumetric flask, you may want to consider the Class A. But I'd keep it for myself, don't let teachers or students use it. If it is for student use, just get the Class B.

It does deteriorate quickly so depends what you are doing with it. We used to do an enzyme prac test for Bio which consumed a lot and it needed to be accurate(ish). They are not doing that prac anymore so I'm not expecting to ever use up even the 500mL bottle now. I will probably throw half of it ou...

That is an odd request, Helen! God, next they'll want you to clean the tripods :yuck: :giggle: I guess try to work out what's on them and why they want them cleaned. Maybe just detergent and a cloth/scourer/brush. But as Rosalie says, make sure they dry quickly. Merilyn, I know right?!! :cheesy: :c...

Shame - in July I will be somewhere between Broome and Kakadu
Don't mean to boast or anything...actually, yes, I am bragging

That is an odd request, Helen! God, next they'll want you to clean the tripods

I guess try to work out what's on them and why they want them cleaned. Maybe just detergent and a cloth/scourer/brush. But as Rosalie says, make sure they dry quickly.

This mandatory standard does not apply to: consumer goods that were first supplied to a consumer before the requirements became mandatory professional equipment where all of the following apply: the equipment is intended to be used in trades, professions or industries the equipment is not intended ...

I was in the same boat, Rosalie - inherited a batch of methylene blue with a Chemwatch label. God knows what was in it. I ended up making up a new batch and labelling it as a percentage concentration. Was easier than trying to work out molarity. Also included the percentage of ethanol. I learnt the ...

We use Tetley, Yorkshire (can buy in Woolies) and Lipton. All will work but the Tetley works the best.
We do this for Year 7 Taster Day - students get one of each to see which works the best.

Loopy wrote: ↑12 Dec 2022, 13:36 where is the old and cranky emoji?

That would be a picture of me

Could it just be sodium hydroxide?

I think it always helps to have teachers who are organised and give plenty of notice for pracs. So have rules about time frames, remind teachers at the start of the year and enforce it for repeat offenders. I'm always understanding of teachers who forget, have plans changed etc. Teachers who order l...

Models - I get from Haines. Victor is helpful in doing special orders for models they don't list on their website but you will have to wait. Usually Eisco brand which are pretty good value and reasonable quality.
I never buy posters as I just don't have the storage for them.