Search found 525 matches

by Lyn
24 Oct 2019, 13:29
Forum: Forum Support Desk
Topic: Problems with AgNO3 solution
Replies: 8
Views: 957

Re: Problems with AgNO3 solution

Silver Nitrate has an indefinite shelf life according to a document on chemical shelf life which I have downloaded off the internet. I use this as a generalised guide for my chemical storage. I have some old stock of silver nitrate which I am still using. I am using the demineralised water that you ...
by Lyn
25 Jun 2019, 10:55
Forum: Sourcing Materials & Eq Repairs
Topic: Dropper bottle teats
Replies: 30
Views: 3430

Re: Dropper bottle teats

Are the red rubber teats available on the Westlab site not the right size for what you require? Seems only logical to check what our lab tech site benefactor has to offer.
by Lyn
19 Jun 2019, 16:34
Forum: Safety with Chemicals
Topic: propylene glycol
Replies: 9
Views: 776

Re: propylene glycol

Look online for Phillip Crisp who developed the Risk Assess program. You will find that he was very much involved with the CSIS but has obviously branched out to develop a program which is very relevant to lab technicians. I would suggest that the information in Risk Assess is far more up to date th...
by Lyn
04 Jun 2019, 12:20
Forum: Safety with Chemicals
Topic: School Uniforms
Replies: 16
Views: 1316

Re: School Uniforms

Lab coats became an OH&S issue for us many years back so we got around the expense issue by buying second hand lab coats. They served the purpose. A number of the coats were from the food and hospitality area so they came with name tags and assorted logos but they kept the kids clean and safe from s...
by Lyn
31 May 2019, 10:16
Forum: Biology, Physics...
Topic: disposal of broth after Pasteurs
Replies: 5
Views: 670

Re: disposal of broth after Pasteurs

Go to Science Assist. They have a document - Guidelines for best practice for Microbiology in Australian schools - with SOP's on handling a range of microbial growths etc. I have just had a quick browse through the document and it covers pretty much all that we have to deal with when students are do...
by Lyn
09 May 2019, 15:51
Forum: Safety with Chemicals
Topic: STORAGE OF SODIUM METAL
Replies: 12
Views: 1475

Re: STORAGE OF SODIUM METAL

Yes I did check Science Assist for that information. I would probably use kerosene as a last resort if there was no other option until such time as a supply of paraffin was available. Question: I have paraffin (heavy) and paraffin (light). Does anyone know what the difference is? Have been reluctant...
by Lyn
09 May 2019, 10:25
Forum: Safety with Chemicals
Topic: STORAGE OF SODIUM METAL
Replies: 12
Views: 1475

Re: STORAGE OF SODIUM METAL

Don't cut it up until you have liquid to store it under. Kerosene will work if you don't have any paraffin oil for storage. Once it is cut and exposed to air any moisture will make it burn violently. I would probably advise never to cut sodium into smaller pieces without storing straight away into t...
by Lyn
03 May 2019, 13:33
Forum: Chemistry and Labware - General
Topic: chipped test tubes
Replies: 13
Views: 1871

Re: chipped test tubes

I just use the Meker burner as it is. Just sit it on a heat mat and rotate the glass rods over the top of the flame until it gets red hot and then gently roll it on the heat mat and try to squash the end a little while the glass is still pliable. Take extreme care when doing this as you don't want t...
by Lyn
03 Apr 2019, 10:28
Forum: Sourcing Materials & Eq Repairs
Topic: Sodium Fluoride
Replies: 7
Views: 994

Re: Sodium Fluoride

Sodium Fluoride: DG 6.1 Highly Toxic with severe chronic effects. Known sensitiser. Contact with acids liberates very Toxic gas. Not required in curriculum. This has been on a banned list of chemicals for the NT and South Australia schools for quite a while now. I don't know what the situation is i...
by Lyn
29 Mar 2019, 13:15
Forum: Recipes and Pracs
Topic: Growing green crystals?
Replies: 5
Views: 1423

Re: Growing green crystals?

Potassium aluminium sulphate - more commonly known as alum (can be purchased in chemist shop). Green dye in powder form or try green food colouring. You can buy this sort of thing in kit form (possibly Toyworld or Spotlight perhaps or a hobby shop). Nothing too obnoxious to handle. https://www.scien...
by Lyn
29 Mar 2019, 10:45
Forum: Chemistry and Labware - General
Topic: chipped test tubes
Replies: 13
Views: 1871

Re: chipped test tubes

Yes it was a bit of a rant. One of those days. If your budget is so desperate that you are being asked to do this then my other suggestion is that your science department invests in a MEKER burner. This will produce a much stronger heating surface than an ordinary Bunsen burner. This type of burner ...
by Lyn
28 Mar 2019, 16:44
Forum: Chemistry and Labware - General
Topic: chipped test tubes
Replies: 13
Views: 1871

Re: chipped test tubes

Seriously just put them in the broken glass bin. They are damaged, broken, don't fix them. Bin them. Just get rid of them. Tell whoever left them that they are unrepairable. What were they thinking asking you to do that. If you have the Risk Assess program online it specifically says to discard any ...
by Lyn
20 Mar 2019, 14:53
Forum: Recipes and Pracs
Topic: Tartaric acid
Replies: 4
Views: 832

Re: Tartaric acid

Yeah, either bucket chemistry or perhaps a percentage solution - 1% up to 10% (1g per 100ml, 10g per 100ml). Apart from that the drawback with the one spec in a litre of water is that you end up copping the flak for the prac not working and that sucks.
by Lyn
20 Mar 2019, 13:24
Forum: Recipes and Pracs
Topic: Tartaric acid
Replies: 4
Views: 832

Re: Tartaric acid

What is it for?
by Lyn
20 Mar 2019, 13:16
Forum: Announcements
Topic: Science ASSIST
Replies: 2
Views: 864

Re: Science ASSIST

I have downloaded the Chemical Management Handbook and placed it into the school Risk Management folder online. It forms part of the background information that is relevant to the Science Chemical Register. I have also downloaded the SOP's and placed them in an SOP folder on my desk. So anyone who i...