Search found 422 matches
- 21 May 2024, 09:08
- Forum: Biology, Physics...
- Topic: standardisation of NaOH
- Replies: 13
- Views: 4279
Re: standardisation of NaOH
Not a great lot of help, Rosalie but our guys do a standardisation of NaOH and they get 0.1M NaOH and 0.1M HCl. I agree - wouldn't give them conc acid That's the one I am familiar with. I think they're using new textbooks this year. New teacher as well. Brick cleaner was the alternative "brick...
- 20 May 2024, 10:29
- Forum: Biology, Physics...
- Topic: standardisation of NaOH
- Replies: 13
- Views: 4279
Re: standardisation of NaOH
What concentration of HCl do you send out for the sodium carbonate standardisation prac? The text book asks for concentrated but I'm not giving them that! RiskAssess has 8-10M is ok for 11&12. (Conc. is teacher only).
- 07 May 2024, 12:03
- Forum: Miscellaneous
- Topic: Is this Cornflour ?
- Replies: 14
- Views: 848
Re: Is this Cornflour ?
I just tried the one our HT wants .You can use Conditioner or Dishwashing liquid . Both seemed to work about the same . although the amount of liquid seems more than required . it is sticky . And yes , the mystery stuff in my bags seems to be Cornflour , well at least it works the same as known Cor...
- 07 May 2024, 10:04
- Forum: Miscellaneous
- Topic: Is this Cornflour ?
- Replies: 14
- Views: 848
Re: Is this Cornflower ?
It's just cornfour and water mixed together (food colouring added if you want). For some reason, nearly every recipe I've ever seen says to add the food colouring at the end and work it through but if you add it to the water before mixing the cornflour in then you don't get it all over your hands an...
- 07 May 2024, 08:57
- Forum: Safety with Chemicals
- Topic: mini SDS
- Replies: 18
- Views: 1103
Re: mini SDS
Rosalie - you're an ex-firefighter!! OMG! That is a surprise. Yep, agree, we are a school with comparatively small quantities of chemicals. Maybe if it was a fire in a chemical factory they may want to check on their way. I am full of surprises!! :cheesy: I should be about 160yo for all the career ...
- 06 May 2024, 10:10
- Forum: Safety with Chemicals
- Topic: mini SDS
- Replies: 18
- Views: 1103
Re: mini SDS
As an ex-fire fighter who attended 2 school fires, we did not have time to be checking manifests in the event of a fully involved structure fire and they were both overnight so without a contact person on site there is no way to log on to the system anyway. It sounds nice in theory, but in reality y...
- 06 May 2024, 09:04
- Forum: Miscellaneous
- Topic: Is this Cornflour ?
- Replies: 14
- Views: 848
Re: Is this Cornflower ?
Feed some to Year 8? Probably wouldn’t take much convincing ….. but no :cheesy: iodine test for starch? Brilliant Rosalie . I missed the bleeding obvious . Knew one of you would have a suggestion . \:D/ Will test it on Tuesday . I just hate unlabelled things . I get that hazardous stuff must be lab...
- 03 May 2024, 13:39
- Forum: Miscellaneous
- Topic: Is this Cornflour ?
- Replies: 14
- Views: 848
Re: Is this Cornflower ?
iodine test for starch?
- 29 Apr 2024, 09:11
- Forum: Announcements
- Topic: Welcome back to term 2
- Replies: 7
- Views: 3881
Re: Welcome back to term 2
Gosh, has it really been a year since you left for your big holiday?? I agree, it was a very long 11 weeks! We are straight back into full swing today (no pupil free day for us) but I have no pracs booked in as yet so I'm planning a crazy-big clean up today! Last term saw me helping out in admin mor...
- 12 Apr 2024, 14:08
- Forum: Announcements
- Topic: Happy Easter to you all
- Replies: 6
- Views: 6925
Re: Happy Easter to you all
After our little taster 2 weeks ago, let the real holidays begin!! Only about an hour to go for me! This has felt like a VERY long term!!
- 02 Apr 2024, 08:29
- Forum: Announcements
- Topic: Happy Easter to you all
- Replies: 6
- Views: 6925
Re: Happy Easter to you all
Thanks Labbie! I must admit I hit "holiday mode" yesterday and did not want to come to work today! I am looking forward to the two weeks off soon though.
- 02 Apr 2024, 07:52
- Forum: Sourcing Materials & Eq Repairs
- Topic: pipette racks to give away
- Replies: 4
- Views: 7593
Re: pipette racks to give away
I can't open it either, but if it is for normal pipettes, I would love one (or two or three?)! Also happy to pay postage.
- 26 Mar 2024, 08:26
- Forum: Miscellaneous
- Topic: Cleaning of Wicks Used in Alkanols prac
- Replies: 6
- Views: 7546
Re: Cleaning of Wicks Used in Alkanols prac
We don't have enough spirit lamps at this school so unfortunately they do need to be reused (mainly due to the conductivity stars not being able to be used with bunsens these days, so we have to use the burners with metho). I just wash the wicks in hot water in the sink and let them air dry. I don't...
- 18 Mar 2024, 13:03
- Forum: Biology, Physics...
- Topic: frozen hearts - help!
- Replies: 10
- Views: 8274
Re: frozen hearts - help!
Soak them in a bucket with nappysan overnight at least, then throw in the machine. What comes out comes out and what doesn't - depends how fussy your school is. President lab coats sell theirs for a pretty good price and great quality if you need to replace. These ones are brand new! This was the f...
- 18 Mar 2024, 11:22
- Forum: Biology, Physics...
- Topic: frozen hearts - help!
- Replies: 10
- Views: 8274
Re: frozen hearts - help!
Following on... Some of the kids were quite messy and I wasn't able to wash the lab coats until this morning. The blood stains haven't come out - any suggestions as to how to get them back to white? I generally use the food tech washing machine and then put it through on an empty cycle afterwards bu...
- 18 Mar 2024, 11:15
- Forum: Biology, Physics...
- Topic: frozen hearts - help!
- Replies: 10
- Views: 8274
Re: frozen hearts - help!
How did they go today ? It went well. One teacher didn't want the pluck yet so I'm hoping it's still ok when he decides to look at it. Everything finished defrosting enough in the fridge overnight. I will be asking if I can get them fresh next time I order. Individually packaged sounds much more co...
- 18 Mar 2024, 11:08
- Forum: Sourcing Materials & Eq Repairs
- Topic: Rubens Tube
- Replies: 3
- Views: 2574
Re: Rubens Tube
I haven't purchased one, but cider house tech has them on their website.
- 15 Mar 2024, 09:10
- Forum: Biology, Physics...
- Topic: frozen hearts - help!
- Replies: 10
- Views: 8274
Re: frozen hearts - help!
I will know for next time - thank you! The place I got them from gave them to me already frozen and smooshed together in a big bag. I defrosted them enough to separate into 2 class sets and then refroze so my concern was more the smell than the safety for eating. The last time we did this was how I ...
- 14 Mar 2024, 13:35
- Forum: Biology, Physics...
- Topic: frozen hearts - help!
- Replies: 10
- Views: 8274
frozen hearts - help!
I have hearts (x16) and plucks (x2) that were frozen. I took them out at about 8:45am and at 2:30pm they still have ice on them! They are needed at 11am tomorrow. Is it too risky leaving them in my sink overnight? I was planning to put them in the fridge when I leave this afternoon... but I am worri...
- 11 Mar 2024, 09:08
- Forum: Safety with Chemicals
- Topic: Standard Operating Procedure (SOP) for removal of chemicals
- Replies: 10
- Views: 4621
Re: Standard Operating Procedure (SOP) for removal of chemicals
:cheesy: Ah yes... "sensible"... At my old school I discovered a broken mercury thermometer in one of my prep room drawers. I don't know how long it had been there and how long the little balls of mercury had been rolling around! I also had a not-at-all-sensible teacher (again, at my old s...