Australia's Science Forum

That limit 20L sounds more like it.
100L and additional 250L in flammable cabinet seems VERY excessive for a school.
Lada

Hi Melsid,
I was just going to suggest a sign with Do not put your lunch in here. You have no idea how many times I had to point that out, only to be told, they are not touching the chemicals, dah..
Lada

Only in water bath or heating mantle, never over open flames (bunsen burner).
Not sure why you have to keep it boiling, but if kept away from flames should be fine.
Lada

Yep, Noona,
thats it. Red wine and chocolate!!
Lada

NaOH pellets in water

We do not stain it . Students can see the strands in the t/tube or they can pull it out with tweezers.
Lada

We use fruit loops or nutrigrains.
Peanuts are banned in our school. Pasta is doable, but takes a long time to light and keep it going.
Lada

Hi, Robyn,could I get the info too, please
Lada

Well done,mazcheck,

I LOVE chemtalk, really helpful.
Lada

Our Ca(OH)2 must be at least 20yrs old and I still use it. Make sure, you have enough undissolved powder on the bottom of container. Maybe leave it for a couple of days and shake it regularly and than filter the clear solution. I never had that trouble, so not sure what to advise you except make sur...

Similar to fibreweb, I wash dirty glassware, when needed (most days), replace into each lab (I have 4) about once a week, make sure all the equipment is back under benches, wipe benches after dissections or dirty prac etc, but do not place used equipment back into bins, when I can get away with it. ...

Is it gravimetric? We use 7% barium chloride solution to drop out the sulfate from fertilizer ( it presipitates as barium sulfate)
Lada

We use ammonium molybdate for Phosphate analysis by colorimetric method.I think molybdate is complexing agent and colours the solution blue.
Lada

Most of them are in glass, only HF must be in plastic as it attacks glass.
I have all my diluted acids in plastic containers.
Lada

I guess even five hits with hammer would have done just as well. Slinky is very tuff

I get stuck (funny that) with kids on lunchtime detention, so they get to fix slinkies, clean whiteboards, cut out shapes for next 2 years of pracs , wash t/tubes etc

I do the same as Ian. Sometimes cover the whole label and put a letter on it, sometimes if needed, I leave the risk phrases on the bottle and just cover name of chemical. It is handy to know straight away, what the chemical is , in case of emergency.
Lada

It is a pain, but I have to make up Fe2+ on the day or the day before. It oxidizes to Fe3+

Just another thought.
Maybe confirmation tests give you positive results for both Fe ions but NaOH test will separate Fe2+ from Fe3?

Yes, that one is tricky.
Make sure you have very fresh Fe2+ .
Use potassium ferrocyanide for Fe3+
and potassium ferricyanide for Fe2+ test.
Good luck