Search found 196 matches

by Marama T
14 Feb 2023, 09:01
Forum: Sourcing Materials & Eq Repairs
Topic: Volumetric flasks
Replies: 10
Views: 3585

Re: Volumetric flasks

Taken from Google - Class A Borosilicate volumetric glassware has superior thermal and chemical resistance and is better suited to glassware for storage of solutions, e.g. flasks. The use of Class A borosilicate glass for volumetric glassware means accuracy is retained over a longer working lifetime...
by Marama T
14 Feb 2023, 08:49
Forum: Safety with Chemicals
Topic: storage of H2O2
Replies: 12
Views: 7311

Re: storage of H2O2

We use H2O2 a lot, and I always buy the 2.5L container. We keep it in the fridge (technically not recommended unless it's a "spark-free" fridge, whatever that is). Have had no issues with decomposition yet. I would estimate sometimes we use stuff that's at least two years old.
by Marama T
24 Nov 2022, 06:56
Forum: Chemistry and Labware - General
Topic: Chemical store Room
Replies: 21
Views: 6776

Re: Chemical store Room

Our ferrous chloride is in CS cabinet with the other class 8 stuff.
by Marama T
24 Nov 2022, 06:50
Forum: Miscellaneous
Topic: looking for slater bugs-investigating science
Replies: 2
Views: 1121

Re: looking for slater bugs-investigating science

Slaters are very common and easy to find. Leaf litter or under logs or rocks are the best places. Good luck!
by Marama T
22 Nov 2022, 12:09
Forum: Safety with Chemicals
Topic: Experiment gone wrong
Replies: 28
Views: 4104

Re: Experiment gone wrong

The versions I've seen call for lighter fluid, metho, or ethanol. Perhaps any accelerant will do.
by Marama T
22 Nov 2022, 08:32
Forum: Safety with Chemicals
Topic: Experiment gone wrong
Replies: 28
Views: 4104

Re: Experiment gone wrong

I just got sent a link via RiskAssess from a teacher who wants to show the kids the experiment that went so wrong. The first thing my eye fell on was "Do not perform this experiment in windy conditions". This warning was repeated several times. I think that teacher is in big trouble.
by Marama T
22 Nov 2022, 07:48
Forum: Safety with Chemicals
Topic: Experiment gone wrong
Replies: 28
Views: 4104

Re: Experiment gone wrong

And sugar. We've done it here small-scale. Fine to do inside. I wonder why they decided on outdoors. Teacher must have used a lot of metho. It would have been like napalm - those kids are not going to enjoy science with flames or explosions in the future. I wonder if anyone did a risk assessment. Su...
by Marama T
09 Nov 2022, 08:04
Forum: Chemistry and Labware - General
Topic: pH Charts
Replies: 25
Views: 3165

Re: pH Charts

:clap3: And thank you from me too!
by Marama T
01 Nov 2022, 07:59
Forum: Chemistry and Labware - General
Topic: pH Charts
Replies: 25
Views: 3165

Re: pH Charts

These are amazing. Will definitely be appropriating them. Thank you.
by Marama T
27 Oct 2022, 12:15
Forum: Safety with Chemicals
Topic: waste bottle labels
Replies: 18
Views: 4715

Re: waste bottle labels

For an example, this is from RiskAssess for sodium nitrate.
Disposal
Retain for collection by a waste service. Do not place in the garbage. <100 g/day may be dissolved in 10 times the mass of water and poured down the drain.

If you don't have RiskAssess, use the SDSs.
by Marama T
25 Oct 2022, 08:12
Forum: Chemistry and Labware - General
Topic: Electrophoresis Kits
Replies: 21
Views: 7786

Re: Electrophoresis Kits

I am amazed! And now feeling slightly inadequate.
by Marama T
18 Oct 2022, 11:26
Forum: Sourcing Materials & Eq Repairs
Topic: swan neck tubes
Replies: 25
Views: 6341

Re: Swan neck tubes

Perhaps try "swan-neck flask" instead.
by Marama T
18 Oct 2022, 09:23
Forum: Recipes and Pracs
Topic: Calcium Fluoride
Replies: 5
Views: 1597

Re: Calcium Fluoride

I made up a 0.1M solution of calcium fluoride last week and got a cloudy solution with some left on the bottom, so some of it dissolved. Interestingly, CaF2 is so insoluble that the labelling program on RiskAssess won't allow for the concentration to be listed - it assumes you're labelling the solid.
by Marama T
13 Oct 2022, 11:34
Forum: Safety with Chemicals
Topic: waste bottle labels
Replies: 18
Views: 4715

Re: waste labels

I just use paper labels and write in pencil on those. I do put stickers on the bottles re who can use them (the coloured dots). All the heavy metals should be separate, as they're too hard to neutralise when mixed. I learned from somewhere... Lead waste - add solid sodium carbonate, decant clear sup...
by Marama T
13 Oct 2022, 11:03
Forum: Recipes and Pracs
Topic: Iron III Nitrate
Replies: 7
Views: 1600

Re: Iron III Nitrate

I'll know this by next week! We're doing that prac too. Sorry I can't help you now.
by Marama T
08 Sep 2022, 13:07
Forum: Announcements
Topic: Banned from 1 NOV
Replies: 43
Views: 8377

Re: Banned from 1 NOV

I love it that we are finally doing this.
by Marama T
08 Sep 2022, 12:51
Forum: Biology, Physics...
Topic: waste from dissections
Replies: 9
Views: 1878

Re: waste from dissections

Already have. They accept any organic matter.
by Marama T
08 Sep 2022, 11:44
Forum: Biology, Physics...
Topic: waste from dissections
Replies: 9
Views: 1878

Re: waste from dissections

I wrap mine in paper and put it in my green bin at home - it becomes compost! I flat-out refuse to put it in landfill. Too wasteful, and it causes the release of methane, a potent greenhouse gas.
by Marama T
15 Jun 2022, 09:29
Forum: Recipes and Pracs
Topic: Oxygen gas jars
Replies: 9
Views: 1965

Re: Oxygen gas jars

Use the name as a clue - "20 volumes" mean that from a given volume of hydrogen peroxide, the decomposition reaction will give off 20 times that volume of oxygen. So I suppose you could use one twentieth the combined volume of your gas jars. MnO2 is just a catalyst in the reaction.
by Marama T
14 Jun 2022, 11:41
Forum: Safety with Chemicals
Topic: Stocktake programs
Replies: 22
Views: 2805

Re: Stocktake programs

I used Chemwatch FFX Gold in other schools, but just use Excel now.