Search found 408 matches
- 06 May 2024, 12:17
- Forum: Miscellaneous
- Topic: Is this Cornflour ?
- Replies: 14
- Views: 1007
Re: Is this Cornflower ?
As it is in ziplock bags etc, I doubt it is harmful. Personally I'd just open it feel the texture and take it from there. Test the prac with it, if it works use gloves and do it, kids can't take it home anyway. Also what is the prac without borax that works? If it is used properly borax is no worse ...
- 06 May 2024, 12:11
- Forum: Safety with Chemicals
- Topic: mini SDS
- Replies: 18
- Views: 1916
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 ...
- 15 Apr 2024, 15:46
- Forum: Safety with Chemicals
- Topic: Chemical Storage
- Replies: 14
- Views: 10984
Re: Chemical Storage
My register/stocktaking document is off the Vic ed dept site. It is in alphabetical order, it tells you chemical/substance, room for amount, container size, strength, hazardous substance, dangerous goods, dangerous goods class with description, sub catergory and packaging group. eg Acetic acid glaci...
- 12 Feb 2024, 15:14
- Forum: Recipes and Pracs
- Topic: making cell models
- Replies: 10
- Views: 5987
Re: making cell models
They shouldn't eat science experiments so use gelatine. Personally I hate the smell so I use jelly crystals, and whatever, split peas, pasta, no lollies etc. I have all different pasta shapes dyed different colours for one cell prac and they glue them onto a bit of card. I think bits of wool for wig...
- 12 Feb 2024, 15:08
- Forum: Announcements
- Topic: Welcome back everyone
- Replies: 18
- Views: 7314
Re: Welcome back everyone
Welcome back to you all too. Invite all your labbie friends to get back onto chemtalk, I miss the daily discussions. It's a lonely job when you're the only school lab tech for miles.
- 12 Feb 2024, 15:06
- Forum: Recipes and Pracs
- Topic: colour change when heated
- Replies: 7
- Views: 3077
Re: colour change when heated
Keep me posted, I want to know if the iron oxide works.
- 15 Nov 2023, 09:15
- Forum: Safety with Chemicals
- Topic: nickel sulfate
- Replies: 11
- Views: 14410
Re: nickel sulfate
I think the 0.1M is for precipitates. We use the foil for magnet pracs. Maybe the solid in crystal gardens. All waste is collected. PPE used. Dont touch it, drink it, or sniff it etc. Most of our chemicals will have associated dangers. You should always err on the side of caution and use PPE.
- 08 Nov 2023, 08:07
- Forum: Chemistry and Labware - General
- Topic: McCartney Bottles
- Replies: 2
- Views: 4573
Re: McCartney Bottles
Use a stopper. I have a stack of lids that seem to fit lots of little bottles. Don't know where they came from though. I use little bottles for powder testing, keep them in kits.
- 18 Oct 2023, 11:39
- Forum: Chemistry and Labware - General
- Topic: Dresden ??? jar
- Replies: 6
- Views: 5581
Re: Dresden ??? jar
I would love to see a pic of the top and also of the rubber bung removed to have a better look at it but, I think the name is Dreschel Bottle It also seems to be called a Dressel bottle and a Drechsler bottle It is a Gas washing Jar as far as I can tell . Drechsler.jpg The inverted level marks I th...
- 18 Oct 2023, 11:38
- Forum: Chemistry and Labware - General
- Topic: Dresden ??? jar
- Replies: 6
- Views: 5581
Re: Dresden ??? jar
Solution from an ex teacher. It is a transfusion bottle. From the old days when blood transfusions were done with glass bottles. The Bung top has 2 options for either metal or plastic insert. A small hole.
There is the long glass tube within to breathe so as to allow it to run when upside down.
There is the long glass tube within to breathe so as to allow it to run when upside down.
- 11 Oct 2023, 09:14
- Forum: Chemistry and Labware - General
- Topic: Dresden ??? jar
- Replies: 6
- Views: 5581
Re: Dresden ??? jar
pic:
it has an outlet spot on top for a very small tube? And inside is a capillary tube like thing, so it must invert and displace something I think.
it has an outlet spot on top for a very small tube? And inside is a capillary tube like thing, so it must invert and displace something I think.
- 11 Oct 2023, 08:54
- Forum: Recipes and Pracs
- Topic: Iodine Clock Reaction
- Replies: 6
- Views: 8216
Re: Iodine Clock Reaction
Wondering if anyone has an update for this reaction. my old recipe is 1. 0.10M Potassium Iodide (KI 16.60 g/L) 2. 0.01M Sodium Thiosulphate (Na2S2O3.5H2O, 2.48g/L) 3. 3% Starch 4. 0.04M Sodium Persulphate (Na2S2O8. 9.52g/L) mix 100ml of 1., 10ml of 2., and 1ml of 3.,in a 500ml flask. Add 100ml of 4....
- 11 Oct 2023, 08:43
- Forum: Forum Support Desk
- Topic: How to post a picture on Chemtalk
- Replies: 8
- Views: 18342
Re: How to post a picture on Chemtalk
If you are posting Pics from an Iphone , you will still need to resize pics first .( I'm sure there would be an android version too) I have a free app called "resize It " .It is also handy for rotating pics that appear sideways when you post them . The trick for sideways pic is to click o...
- 05 Oct 2023, 09:27
- Forum: Chemistry and Labware - General
- Topic: Dresden ??? jar
- Replies: 6
- Views: 5581
Dresden ??? jar
Help, how do I post a photo of glassware I am trying to identify? I thought it was a dresden jar but I can't find it when I search www, under that name.
- 04 Oct 2023, 10:08
- Forum: Chemistry and Labware - General
- Topic: Chemicals not sold by Westlab or other common suppliers
- Replies: 13
- Views: 7121
Re: Chemicals not sold by Westlab or other common suppliers
Wondering how this prac request went and did you make methyl orange? It is good to make analytical reagents/indicators. I have a great book which has recipes for universal indicators, however I would google the chemical's safety, before purchasing. If necessary I would look for an alternative prac, ...
- 03 Oct 2023, 12:47
- Forum: Recipes and Pracs
- Topic: barium nitrate solution.
- Replies: 6
- Views: 5705
Re: barium nitrate solution.
Depends how much you use, how much space you have etc. I sometimes decant into a bottle of each strength if they are in dropping bottles. I would keep 0.1M for sure.
- 03 Oct 2023, 12:00
- Forum: Chemistry and Labware - General
- Topic: Burettes
- Replies: 12
- Views: 9642
Re: Burettes
I run it under warm to hot water, if you just want to tip it out/collection waste, diluting it wont matter.
- 06 Sep 2023, 16:14
- Forum: Safety with Chemicals
- Topic: empty bottle disposal
- Replies: 3
- Views: 5045
Re: empty bottle disposal
Agreed Marama T, I reuse them if possible. But if they are clean should be recyclable.
- 31 Aug 2023, 11:41
- Forum: Recipes and Pracs
- Topic: Silica gel for chemical garden
- Replies: 7
- Views: 6111
Re: Silica gel for chemical garden
I have sodium silicate solution, it is thick and doesn't work as well as the old solution I inherited. The original was made from a powder which you added water to and dissolved under pressure. firstly I never managed to dissolve it even with a pressure cooker. Secondly the newer one i bought is too...
- 23 Aug 2023, 16:00
- Forum: Sourcing Materials & Eq Repairs
- Topic: refraction semi circles
- Replies: 5
- Views: 5164
Re: refraction semi circles
I always wondered what these were used for. Now I know. We have used beakers with different solutions.....despite having a few of the semi circle things. Another thing I know now. Thank you.