Search found 74 matches

by rosaliemb
17 Oct 2012, 11:31
Forum: Recipes and Pracs
Topic: oscillating reaction Briggs-Rauscher
Replies: 5
Views: 3577

Re: oscillating reaction Briggs-Rauscher

Prof Bunsen has a kit of all chemicals needed for this. "The Facinating Oscillating Reaction kit"
I couldn't locate source of malonic acid.

Rosaliemb(another one) :D
by rosaliemb
17 Oct 2012, 11:25
Forum: Recipes and Pracs
Topic: sodium thiosulphate - and HCL
Replies: 5
Views: 2580

Re: sodium thiosulphate - and HCL

Use for classic rate of reaction experiments, to show/measure how temperature and concentration effect the rate. Use 2M HCl and 0.25M sodium thiosulphate. The two chemicals react to form a sulphur colloid makingthe solution cloudy. The time taken for the precipitate to obscure a cross marked on a pi...
by rosaliemb
21 Sep 2012, 09:50
Forum: Miscellaneous
Topic: Only in the Top half of Australia!
Replies: 15
Views: 5921

Re: Only in the Top half of Australia!

Thanks for the warning reminder.
In the Top End (of NT) it pays to be vigilant and take heed of warning signs.
No crocs in Alice Springs except at the Reptile Park

Rosalie (anotherone) :D
by rosaliemb
12 Sep 2012, 09:43
Forum: Chemistry and Labware - General
Topic: Conc Sulphuric Acid
Replies: 14
Views: 6873

Re: Conc Sulphuric Acid

Thanks for the replies.
So is OK to use and I don't have to worry about disposal. Can use it to make a carbon pillar with sugar!

Rosalie (another one) :D
by rosaliemb
11 Sep 2012, 10:29
Forum: Chemistry and Labware - General
Topic: Conc Sulphuric Acid
Replies: 14
Views: 6873

Conc Sulphuric Acid

Decanted Sulphuric acid concentrated, put into a smaller dropper bottle for student use, goes dark colour after some time. Is it still OK to use?
Used for ester preparation.

Thanks
Rosalie (another one) :D
by rosaliemb
10 Sep 2012, 13:31
Forum: Announcements
Topic: St MARY'S 2012
Replies: 123
Views: 35307

Re: St MARY'S 2012

Anyone who can, should be there!

Lots of friendly lab techs happy to share and lots of great workshops.
Feeling left out as I will not be there myself, and remembering my wonderful visit a couple of years ago

Rosalie (another one) :-(
by rosaliemb
20 Aug 2012, 09:08
Forum: Chemistry and Labware - General
Topic: Tollen's reagent
Replies: 3
Views: 2769

Re: Tollen's reagent

Thanks NT,
I'll keep your advice in case the another new chemistry teacher wants to use it. And I'm sure useful for others.

Winge. With turnover of teachers we seem to suffer here, I never know what prac they might want to do or need to resurect ones done years ago.

Rosalie (another one)
by rosaliemb
07 Aug 2012, 13:36
Forum: Sourcing Materials & Eq Repairs
Topic: Quadrats?
Replies: 23
Views: 11749

Re: Quadrats?

I have used wooden dowel and drip irrigation elbow joints. Can be easily disassemblied.

Rosalie (another one)
by rosaliemb
23 May 2012, 14:33
Forum: Sourcing Materials & Eq Repairs
Topic: plastic butettes
Replies: 12
Views: 4047

Re: plastic butettes

Alcohols are not a good idea in plastic burettes either. They dissolve, as one teacher found out.
Rosalie (another one)
by rosaliemb
21 May 2012, 09:44
Forum: Announcements
Topic: hello
Replies: 20
Views: 7636

Re: hello

Thanks,
Found a couple of new ones. And some refreshing good mood enhancers. Might be a good reference port for when feelling frustrated!
Rosalie (another one) :D
by rosaliemb
21 May 2012, 09:18
Forum: Announcements
Topic: hello
Replies: 20
Views: 7636

Re: hello

Dear Bindibadji,
Please have you anymore cats? I love them.
Rosalie (another one) :D
by rosaliemb
02 May 2012, 10:11
Forum: Safety with Chemicals
Topic: WHAT are new rules on culturing micro-organisms
Replies: 55
Views: 17550

Re: WHAT are new rules on culturing micro-organisms

Sterilize swabs.
I put two cotton buds in small test tube. Stopper with cotton wool. Put them in a brown paper bag and "cook" them in the oven at 160 degrees for about an hour. Glass ware, for example test tubes or petri dishes can be treated same way.

Rosalie (another one) :D
by rosaliemb
02 May 2012, 09:53
Forum: Chemistry and Labware - General
Topic: Lugols Iodine
Replies: 16
Views: 5706

Re: Lugols Iodine

Lugols iodine is used to preserve algae . The iodine solution is added to the sample so it looks like weak tea. The algae are killed and sink to the bottom and then this can be subsampled. Best though is looking at fresh live specimens as you can view motility and their real colour. The KI of Lugols...
by rosaliemb
14 Mar 2012, 09:16
Forum: Safety with Chemicals
Topic: Are these chemicals appropriate
Replies: 21
Views: 6690

Re: Are these chemicals appropriate

I make up Bromine water.
150ml 0.2M K Bromide
0.15g K Bromate
25 ml 2M HCl

Rosalie (another one) :D
by rosaliemb
10 Feb 2012, 09:30
Forum: Biology, Physics...
Topic: Aceto-orcein stain for nucleic acids
Replies: 2
Views: 1973

Re: Aceto-orcein stain for nucleic acids

Thanks Noona I have now read the entry in The Laboratory, properly this time and it answered my queries with a bit more detail. I will recomend using a microscope lamp to heat the slide, instead of a hotplate as writen in the Key ideas in Biology (NT) prac booklet Best wishes Rosalie (another one) :D
by rosaliemb
08 Feb 2012, 12:54
Forum: Biology, Physics...
Topic: Aceto-orcein stain for nucleic acids
Replies: 2
Views: 1973

Aceto-orcein stain for nucleic acids

Please , what is the procedure for staining using aceto-orcein. In SACE stage 2 Biol it is used to identify nucleic acids in cells
Thanks
Rosalie (anotherone) :D
by rosaliemb
08 Feb 2012, 12:31
Forum: Chemistry and Labware - General
Topic: Copper Mesh (Gauze)
Replies: 8
Views: 3468

Re: Copper Mesh (Gauze)

I found it at Westlab (Vic) It is expensive $45 for 30cm square and mesh is quite fine. I would have thought flywire mesh size more suitable. What does Rita use?
Rosalie (anotherone) :D
by rosaliemb
09 Dec 2011, 09:30
Forum: Biology, Physics...
Topic: Preserved specimens storage
Replies: 1
Views: 1321

Preserved specimens storage

Where do i store my preserved specimens which are in 70% alcohol? General store or Chemicals store? And if in the chem store should they be in the flamables cupboard (where there is not enough room anyway)? At present they are in the general store room.
Rosalie (ampther one) :-)
by rosaliemb
06 Dec 2011, 12:27
Forum: Safety with Chemicals
Topic: labels for dilute solutions
Replies: 5
Views: 2831

Re: labels for dilute solutions

Thanks Whspa and Jazz.
With your tips I am able to get just what i needed, so there will be some new labelling going on here.
Happy Christmas break to you and to all lab techs who help aother lab techs

Rosalie (another one) :D
by rosaliemb
05 Dec 2011, 14:36
Forum: Safety with Chemicals
Topic: labels for dilute solutions
Replies: 5
Views: 2831

labels for dilute solutions

I have access to Chemgold 3. If I want to use a label for diluted solutions of chemicals e.g. 0.1 M Hydrochloric acid, the only label availaable is for the concentrated solution. Am I missing something? What do other people use for class sets of chemical solutions. I have been using Label Maker from...