Search found 1155 matches
- 23 Feb 2023, 13:36
- Forum: Biology, Physics...
- Topic: Year 12 Biology Depth Studies
- Replies: 11
- Views: 11792
Re: Year 12 Biology Depth Studies
Or try Southern Biological - they will sell something.
- 23 Feb 2023, 13:35
- Forum: Chemistry and Labware - General
- Topic: standardized NaOH
- Replies: 20
- Views: 9129
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...
- 22 Feb 2023, 06:32
- Forum: Safety with Chemicals
- Topic: Risk Assessment
- Replies: 7
- Views: 2770
Re: Risk Assessment
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...
- 21 Feb 2023, 07:49
- Forum: Sourcing Materials & Eq Repairs
- Topic: gauze mats with solid centre
- Replies: 6
- Views: 2485
Re: gauze mats with solid centre
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.
- 20 Feb 2023, 07:50
- Forum: Safety with Chemicals
- Topic: chemical waste
- Replies: 24
- Views: 8606
Re: chemical waste
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.
- 17 Feb 2023, 10:50
- Forum: Safety with Chemicals
- Topic: chemical waste
- Replies: 24
- Views: 8606
Re: chemical waste
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...
- 17 Feb 2023, 10:46
- Forum: Safety with Chemicals
- Topic: chemical waste
- Replies: 24
- Views: 8606
Re: chemical waste
The solid can be wrapped and put into the bin.
- 17 Feb 2023, 06:46
- Forum: Chemistry and Labware - General
- Topic: Sodium Dichromate for cleaning glassware
- Replies: 23
- Views: 10069
Re: Sodium Dichromate for cleaning glassware
Yep - bin them. Does sound like the NaOH effect, but who knows?
- 14 Feb 2023, 06:53
- Forum: Sourcing Materials & Eq Repairs
- Topic: Volumetric flasks
- Replies: 10
- Views: 4996
Re: Volumetric flasks
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.
- 09 Feb 2023, 11:18
- Forum: Safety with Chemicals
- Topic: storage of H2O2
- Replies: 12
- Views: 9090
Re: storage of H2O2
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...
- 07 Feb 2023, 13:48
- Forum: Sourcing Materials & Eq Repairs
- Topic: Cleaning retort clamps
- Replies: 7
- Views: 2710
Re: Cleaning retort clamps
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...
- 07 Feb 2023, 13:45
- Forum: Miscellaneous
- Topic: Conferences
- Replies: 16
- Views: 13040
Re: Conferences
Shame - in July I will be somewhere between Broome and Kakadu
Don't mean to boast or anything...actually, yes, I am bragging
Don't mean to boast or anything...actually, yes, I am bragging
- 07 Feb 2023, 10:32
- Forum: Sourcing Materials & Eq Repairs
- Topic: Cleaning retort clamps
- Replies: 7
- Views: 2710
Re: Cleaning retort clamps
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.
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.
- 07 Feb 2023, 06:52
- Forum: Chemistry and Labware - General
- Topic: Button Cell Batteries NEW Regulation 2022
- Replies: 4
- Views: 2751
Re: Button Cell Batteries NEW Regulation 2022
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 ...
- 06 Feb 2023, 06:49
- Forum: Safety with Chemicals
- Topic: methylene blue
- Replies: 3
- Views: 2472
Re: methylene blue
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 ...
- 02 Feb 2023, 13:35
- Forum: Recipes and Pracs
- Topic: Tea Bag Prac.... need help
- Replies: 8
- Views: 2991
Re: Tea Bag Prac.... need help
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.
We do this for Year 7 Taster Day - students get one of each to see which works the best.
- 14 Dec 2022, 14:13
- Forum: The Lab Tech Position
- Topic: Tips for next year
- Replies: 7
- Views: 3253
- 08 Dec 2022, 11:10
- Forum: Chemistry and Labware - General
- Topic: White crystal around sodium hydroxide solution bottles
- Replies: 14
- Views: 6755
Re: White crystal around sodium hydroxide solution bottles
Could it just be sodium hydroxide?
- 07 Dec 2022, 07:25
- Forum: The Lab Tech Position
- Topic: Tips for next year
- Replies: 7
- Views: 3253
Re: Tips for next year
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...
- 07 Dec 2022, 07:13
- Forum: Sourcing Materials & Eq Repairs
- Topic: Posters and Models for Biology
- Replies: 3
- Views: 2966
Re: Posters and Models for Biology
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.
I never buy posters as I just don't have the storage for them.