Australia's Science Forum

How strange I just put it through chemwatch and no match found. Is that the commercial name or there a main ingredient? Diphoterine® is the commercial name. It contains a polyvalent amphoteric salt as the proprietory active ingredient. That appears to be code for: "we're not going to tell y...

What concentrations are you using, and in what proportion? At 3.89 g/dL (20 °C), barrium hydroxide is reasonably soluable, but much less so than either sodium hydroxide (109%) or barium chloride (35.8%). Ba(OH)2: 3.89 g/dL / 171.3425g/mol = 0.23 M. You will not get a precipitate if you are mixing...

Try it with various milks; such as non-fat, full-cream, et cetera. Milk might be a problem because it is homogenised; there no seperation of fluid layers, thus making it less than ideal. It is also opaque. A mixture of distilled water and cooking oil would possibly be a clearer demonstration. Mix t...

As far as I know Sudan II, III, and IV have been classified as carcinogen category 3 by the International Agency for Research on Cancer, which is: "not classifiable as to carcinogenicity in humans."

Has there been a recent update?

rae wrote:Sodium thiosulfate and hcl I think it produces H2S??

Nope. Sulfure and Sulfur Dioxide.

Na2S2O3 + 2 HCl → 2 NaCl + S + SO2 + H2O

"If the burnt sugar is in a beaker, I soak them in NaOH solution and they come clean" you do not have to soak them in NaOH. Just add water and heat, sugar will dissolve in water That will remove the unburned sugar. Unfortunately burned sugar is char. Carbon does not disolve well. The blac...

Hi guys I am a bit confused about the fat test with sudan III/sudan IV. Teacher asked to do fat test and on the sheet it said Sudan III. We had sudan IV but apparently that does the same thing so thought I would test it. It was bought ready made up as a 0.5% solution from Southern Biological. It do...

www.hazchem.net.au/Storage-Cabinets/Oxidising-Agent-Storage-Cabinets.html Oxidizing agents obviously need to be kept away from anything that can be oxidised (such as reducing agents, organics, combustables, et cetera). So, of course, oxidizing cabinets have been made of metal . :-| Even with their ...

Ok so i know that the silver nitrate batch i just made up has turned cloudy and hence is silver chloride.But how much so? Can i still use it to make metallic crystals (i think some people call them magic trees). The prac where you have spiral of copper wire suspended in a small beaker and pour silv...

Yes. That happens often enough. Copper Nitrate adsorbs moisture quite voraciously. You can only try to keep a lid on it. All I can suggest is drilling and chipping away with a spatula, and a lot of spare time. If you break the lump into smaller segments to extract from the container, you can then us...

A teacher just brought in an skeleton of a long necked tortoise and wants it cleaned for display. Although it has been picked fairly clean by ants, it still stinks. It's a lovely intact skeleton, with the neck still fused together. What should I do to clean it up -- preferably without the neck falli...

If I did all the things like not incubating above 30 degrees (it was 34 here yesterday!) taping them completely shut before they look at them, and safely disposing of them, would you think it was OK? WARNING: Never tape culture plates around the edges unless you use Parafilm. Sticky tape just will ...

dime wrote:It does beg the question of why would a corrosive cabinet be made of metal in the first place.

I believe they were required to be metal for security, not storage.

Though I'm not sure if whoever set the standards thought things all the way through. Actually, I'm quite sure they didn't.

I have news for you! I will catch fire even without boiling over. The vapours are extremely flammable. You will be safe with hot plate Lada When ethanol vapours catch fire in cooking, it's called flambé . The ignition flash is sudden and dramatic. It's quite exciting, but... You really do not wa...

I knew it was not happy with Sulfuric acid, so I put ours in the Oxdising cupboard. The chromates and peroxides won't like that. They don't make good neighbours. Could it go into a small corrosive cupboard, with only Iodine solution on the top shelve????????????? Well, okay, if it's well ventilated...

You can store Nitric acid with Hydrochloric acid, but should keep it seperate from Sulfuric acid, and well away from Acetic Acid.

A strip of Parafilm is excellent for sealing plates as it stretches as you slowly pull it around the edge of the plate. Much more to the point is that, quite unlike Cellotape ("sticky" tape), Parafilm is specifically designed to allow oxygen to difuse across its membrane while sealing in ...

• Once agar plates have been exposed or inoculated they must be taped securely closed. Do not remove the tape from plastic Petri dishes and only remove the tape from glass dishes after they have been sterilized. Just to clarrify: "taping securely closed" does not mean airtight. That...

Hi everyone, I have made saturated oxalic acid (about 100mL )for a yr 11 experiment. The CSIS appendix D says it's ok to put it down the sink after making it pH: 8-10. Could anyone please tell me which chemical I add, and how much? Thanks heaps. Kirin You neutralise most acids with Sodium Carbonate...

You could always store the solutions until you need some to treate waste dichromate and permanganate solutions from EEI and such. These solutions are treated with just enough acidified sodium thiosulfate to exactly reduce the metal oxoanions (turning the solution pale blue or clear). Well, sulfuric ...