Search found 557 matches

by dime
23 Nov 2007, 09:25
Forum: Safety with Chemicals
Topic: The Universal Mystery
Replies: 11
Views: 3669

Re: The Universal Mystery

I have made our Universal Indicator for at least 14 years now and when you make it you have to put in the NaOH to make it change from the red to the green. It is quite fun to watch as you add the NaOH, the drops turn green but then it is absorbed by the whole of the liquid and turns red again. You j...
by dime
14 Nov 2007, 14:13
Forum: Safety with Chemicals
Topic: risk assessment
Replies: 145
Views: 38659

Re: risk assessment

Hi Robb

I've only just checked into the fact that most unfortunately I never received your fax re the RA form. Sorry to be a huge nuicance, but could you send it again when you have time, please? Attention Darelle at 67424429. Again sorry for the trouble.
by dime
13 Nov 2007, 14:22
Forum: Sourcing Materials & Eq Repairs
Topic: Microscope Problems
Replies: 2
Views: 1378

Re: Microscope Problems

You probably should ring ISSCO as they are only new. We have had lots of different ones from them with no probs. They would be covered under a guarantee? If not, they would still be the ones to ask how to fix.
by dime
09 Nov 2007, 14:01
Forum: Safety with Chemicals
Topic: acids in plastic bottles
Replies: 11
Views: 3191

Re: acids in plastic bottles

Actually it is not only acids that react. Strong NaOH will also send the plastic brittle. No doubt exposure to light doesn't help. Over the years, I've had a few bottles crack up, but you can usually see a tell-tale crack before the whole thing goes. I still use them 'cause they're lighter to cart a...
by dime
09 Nov 2007, 13:13
Forum: Chemistry and Labware - General
Topic: Clean burnt Sugar from glassware
Replies: 7
Views: 3299

Re: Clean burnt Sugar from glassware

1M or 2M max NaOH should do the trick. It will loosen just about anything. Even melted (sublimed?) sulfur from test tubes or deflagrating spoons. Might need to leave them for a couple of days, just keep soaking till the stuff lifts off. Have a nice weekend all : :D
by dime
18 Sep 2007, 13:24
Forum: Safety with Chemicals
Topic: Chemwatch Issues
Replies: 48
Views: 14878

Re: Chemwatch Issues

Yes I can get in now, but it won't search for the chemical. Small steps - maybe after lunch it will work.
by dime
18 Sep 2007, 10:07
Forum: Safety with Chemicals
Topic: Chemwatch Issues
Replies: 48
Views: 14878

Re: Chemwatch Issues

I've been getting the same deal. All day yesterday and again this morning. Our computer guy said to see him at recess, as it may be an internal error - I don't know about that though. Particularly if you're having the same problem.
by dime
04 Sep 2007, 15:26
Forum: Safety with Chemicals
Topic: risk assessment
Replies: 145
Views: 38659

Re: risk assessment

Hi Robb,
Sorry to get on the band waggon so late, but is there a chance of getting a copy of your R A form please? We are not up to speed here, and I'm sure it is time we were. If you could manage it, our fax number is 67424429
by dime
29 Aug 2007, 11:37
Forum: Chemistry and Labware - General
Topic: Crystalliasation
Replies: 8
Views: 3115

Re: Crystalliasation

I just soak in water - or maybe rinse under hot tap. Don't remember having too many problems.
by dime
20 Jul 2007, 15:18
Forum: Free classifieds - 4 sale/swap/wanted/giveaway
Topic: Free Glassware
Replies: 2
Views: 2213

Re: Free Glassware

Hi,
We use the big leibig condensors (with juniors) and would love some. But getting them from you could prove difficult, as it would mean packaging and posting. Please let me know, if no one else local wants them, and I will put feelers out for some one going to Sydney to pick them up. Ta
by dime
18 Jul 2007, 13:38
Forum: Chemistry and Labware - General
Topic: Standard soap solution
Replies: 4
Views: 3222

Re: Standard soap solution

If the teacher can't tell you how to make it up then whatever you do can't be wrong! So just make it up yourself and it will probably be OK. As the teachers have told me in the past, we only teach bucket chemistry. When you do have to be acurate, they will have the instructions, you can bet.
by dime
18 Jul 2007, 13:31
Forum: Chemistry and Labware - General
Topic: Spirit- Burners
Replies: 4
Views: 2086

Re: Spirit- Burners

I use a Dymo Label Manager, which is just a fancy dymo machine. The labels will still sometimes crinkle, depending how long the label is or the particular burner. But spilt metho etc doesn't make the label run.
by dime
20 Jun 2007, 15:49
Forum: Sourcing Materials & Eq Repairs
Topic: Dilute H2O2
Replies: 5
Views: 2499

Re: Dilute H2O2

For ease of measurement use 50ml 35% H2O2 to 250ml distilled water to give 300ml total. You can buy 6% H2O2 but I got caught recently with the 35% and watered it down as mentioned, with no complaints. Good luck!
by dime
20 Jun 2007, 09:57
Forum: Chemistry and Labware - General
Topic: Sintered Glass Gooch type Crucibles
Replies: 15
Views: 6074

Re: Sintered Glass Gooch type Crucibles

Hi Lada
Thank you very much for your prompt fax. Have handed it on to the chem teacher. Think I'll put a hold on the sintered glass crucibles, as this method does look better, and buy some alizarin red instead. Thanks again.
by dime
19 Jun 2007, 10:43
Forum: Chemistry and Labware - General
Topic: Sintered Glass Gooch type Crucibles
Replies: 15
Views: 6074

Re: Sintered Glass Gooch type Crucibles

hi lada Sorry to be a nuisance, but could I also please get a copy of the titration prac. I was looking to buy the sintered glass crucibles, but it seems they may not be all that wonderful, from the various posts on the subject. Fax number here is 02 67424429 or put on here if easier. Hope it is not...
by dime
18 Jun 2007, 14:25
Forum: Chemistry and Labware - General
Topic: budget
Replies: 12
Views: 4364

Re: budget

Our school has about 630 students and our total budget for this year is $7000. This for everything textbooks, consumables and equipment but not photocoping. In the past it has been up to $15000 but was cut in half :-({|= this year as there was some budgetry crisis or other and I'll bet it won't be r...
by dime
15 Jun 2007, 14:11
Forum: Chemistry and Labware - General
Topic: Sintered Glass Crucibles
Replies: 2
Views: 1704

Sintered Glass Crucibles

Can someone please tell me where we can buy these little cuties. Chem teacher has been after them for a while, and I can't seem to source them. Ta for any help!