Search found 582 matches
- 20 Jun 2018, 10:16
- Forum: Sourcing Materials & Eq Repairs
- Topic: Measuring Cylinders
- Replies: 11
- Views: 7217
Re: Measuring Cylinders
Most of our measuring cylinders are plastic base and plastic collar. From 10ml through to 100ml. I have had very few problems with them and we have been using them for quite a long time. If one breaks I save the base and collar. That way if I have a base that breaks I usually have a replacement some...
- 18 Jun 2018, 11:04
- Forum: Recipes and Pracs
- Topic: 1M Iron (III) Nitrate
- Replies: 4
- Views: 4409
Re: 1M Iron (III) Nitrate
250ml of solution ......101g iron(III) nitrate + 50ml 2M nitric acid (You will need 200ml of water.) You others out there can correct me if I'm wrong. Having a bad week are you? and it's only Monday.
Why on earth does the teacher require the solution to be so strong?
Why on earth does the teacher require the solution to be so strong?
- 06 Jun 2018, 13:42
- Forum: Safety with Chemicals
- Topic: Chemical Safety Procedures
- Replies: 4
- Views: 4506
Re: Chemical Safety Procedures
Having something to work around is better than starting from scratch. Just some adaptation on your part. The "Chemical Management Guidelines" from the University of Melbourne was useful as well and extensive. A lot of reading. Anyhow good luck with your task.
- 06 Jun 2018, 12:15
- Forum: Safety with Chemicals
- Topic: Chemical Safety Procedures
- Replies: 4
- Views: 4506
Re: Chemical Safety Procedures
Hi linotas, Seem to have sent you on a wild goose chase with the "Guidelines for the Storage of Science Chemicals Third Edition 2005 Vic DET". I have checked a number of sites and can't find it anywhere. However I do have a copy of the document and might be able to email it to you if you w...
- 05 Jun 2018, 13:18
- Forum: Safety with Chemicals
- Topic: Chemical Safety Procedures
- Replies: 4
- Views: 4506
Re: Chemical Safety Procedures
Hi linotas, You could start with Science Assist's Chemical Management Handbook for Australian Schools. Science Assist have developed a number of useful guidelines for helping out lab techs around Australia. Download their SOP's. It will save you a lot of time trying to write your own. I will continu...
- 31 May 2018, 15:16
- Forum: Recipes and Pracs
- Topic: Banned experiments
- Replies: 80
- Views: 39535
Re: Banned experiments
Don't do it in the fume cupboard. I had some idiot teacher demonstrate this in the fume cupboard and the resulting mess on the inside of the cupboard took ages to clean up. This demonstration is usually done outside in an open area on a metal tray of sand. Kids can stand well back and observe from a...
- 29 May 2018, 12:23
- Forum: Sourcing Materials & Eq Repairs
- Topic: test tube holders
- Replies: 6
- Views: 4146
Re: test tube holders
We have had our metal test tube holders since the nineties or thereabouts. The head of department got sick of the budding pyromaniacs burning the wooden test tube holders. Haven't had a burning test tube clamp since. They are relatively cheap and easy to use. I think they are a great invention. :thu...
- 23 May 2018, 14:40
- Forum: Safety with Chemicals
- Topic: PbNO3 + KI experiment?
- Replies: 11
- Views: 8859
Re: PbNO3 + KI experiment?
Conservation of Mass - Pearson textbooks Y9 & Y10
Y9 - uses 0.1M solutions of NaOH, CuSO4, sodium carbonate and ammonia.
Y10 - uses solutions of barium nitrate and sodium sulphate.
So far it works.
Y9 - uses 0.1M solutions of NaOH, CuSO4, sodium carbonate and ammonia.
Y10 - uses solutions of barium nitrate and sodium sulphate.
So far it works.
- 17 May 2018, 14:49
- Forum: Recipes and Pracs
- Topic: Uses for starch packing beads
- Replies: 4
- Views: 4508
Re: Uses for starch packing beads
Don't throw them out. I've had mine for ages but they are diminishing in quantity. They can be used for any prac that involves insulation, drink cans with different insulations - measuring temperature drop, making energy wise models of houses (kids love to have paths and gardens using the beads). Mu...
- 01 May 2018, 15:50
- Forum: Announcements
- Topic: WELCOME BACK EVERYONE
- Replies: 9
- Views: 7005
Re: WELCOME BACK EVERYONE
macca, Those succulent chairs look fabulous. Clever you. Yes I'm envious cause I want one now. Unfortunately any succulents which come my way suffer the kiss of death on my back verandah, except for the mother-of-millions that even I can't kill. Fortunately I have long suffering bromeliads which ins...
- 26 Apr 2018, 15:52
- Forum: Biology, Physics...
- Topic: animal cells
- Replies: 3
- Views: 5004
Re: animal cells
Science Assist have an SOP for preparing animal and plant cell slides. The animal cells come from kidneys or fresh steak. The SOP details how to prepare both plant and animal cells. Have a look and download the SOP so you don't have to think about preparing one yourself. It even has instructions for...
- 23 Apr 2018, 10:29
- Forum: Safety with Chemicals
- Topic: S.O.P.s and R.A.s - how long are they valid for?
- Replies: 7
- Views: 5866
Re: S.O.P.s and R.A.s - how long are they valid for?
There are some useful SOP's on Science Assist. Dissection procedures, some equipment procedures, use of safety equipment and some chemical handling procedures. All useful and ready for printing off and storing in folders.
- 23 Apr 2018, 10:11
- Forum: Recipes and Pracs
- Topic: Dialysis tubing
- Replies: 12
- Views: 7366
Re: Dialysis tubing
Yes just cut them to size and the students do the rest, hopefully with proper guidance from the teacher. It is just useful to know how to set up the dialysis tubing in case you see a student struggling to get it done. I was originally shown by another lab tech to wet the tube under running water whi...
- 10 Apr 2018, 13:08
- Forum: Safety with Chemicals
- Topic: Disposal of Sodium Thiosulfate?
- Replies: 14
- Views: 12332
Re: Disposal of Sodium Thiosulfate?
Yes that is the one I saw and although it was a combination of the two chemicals I thought the answer was relevant to your question. It will be interesting to see what the answer is to your original question. I think that if the solution of sodium thiosulfate is very weak that with further dilution ...
- 09 Apr 2018, 13:22
- Forum: Safety with Chemicals
- Topic: Disposal of Sodium Thiosulfate?
- Replies: 14
- Views: 12332
Re: Disposal of Sodium Thiosulfate?
Check the ASSIST site. Yes, dilute with lots of water.
- 09 Apr 2018, 12:55
- Forum: Safety with Chemicals
- Topic: Do we have to keep exhaust fan on 24/7
- Replies: 29
- Views: 14382
Re: Do we have to keep exhaust fan on 24/7
So it's a fire hazard is it? :cheesy: About time for a new cupboard? As for Remlap's broken fan that is a definite health hazard and should be regarded as such. Perhaps a visit to the doctor with regards to your health and some X-rays of your lungs for possible chemical scarring might change their m...
- 09 Apr 2018, 12:36
- Forum: Safety with Chemicals
- Topic: Do we have to keep exhaust fan on 24/7
- Replies: 29
- Views: 14382
Re: Do we have to keep exhaust fan on 24/7
Yes, I was thinking the same thing. The doors to the flammable cupboard need to be kept closed completely. If you had an inspection by the fire department I don't think they would be very pleased to find the door ajar to let the fumes out. If your fan is going 24/7 it should alleviate some of the fu...
- 28 Mar 2018, 17:34
- Forum: Biology, Physics...
- Topic: Phenolphthalein Agar
- Replies: 175
- Views: 98264
Re: Phenolphthalein Agar
$20 for 75g is pretty much on the money for the agar agar. ChemSupply has agar agar at $122 for 500g. So the price is reasonable from the health food store.
- 27 Mar 2018, 13:09
- Forum: Biology, Physics...
- Topic: Phenolphthalein Agar
- Replies: 175
- Views: 98264
Re: Phenolphthalein Agar
I think you are pushing your luck with the gelatine. If you give the teacher something that doesn't work there will be no end to the complaints. Labbie's advice is good or just tell them that when the agar is ordered in then they can have their prac.
- 26 Mar 2018, 13:04
- Forum: Chemistry and Labware - General
- Topic: Life span of Sodium Hydroxide
- Replies: 5
- Views: 4918
Re: Life span of Sodium Hydroxide
Same as Ian. Fresh solutions for the senior chemistry and use up the leftovers and old stock for the junior classes. If the sodium hydroxide precipitates in the bottom of the bottle I decant what I can and neutralise the rest before sending it down the drain. My stock of NaOH is stored in glass bott...