Australia's Science Forum

Hi Estelle We make our Bath Bombs with Citric acid and sodium bi-carbonate 1:2, add oil and colour etc. Oil holds it together. We also sell at school activities. Here is a web link which give a variation, but stills use the above as main ingredients http://www.cookiemadness.net/bath_bombs/. As for b...

Hi Louis Yep you can get these springs, I use the Hook's Law springs to do this one (SSA Cat 1918-001, $19.20 EACH). i use an old 200-500gm reagent bottle with a felt pen inserted (and filled with sand)as shown in the book. I then put 2 holes in the lid to allow a loope of wire through the lip to ho...

Hel


Do as Rob says as you may find that not all the Calcium has oxidised as you think, and there is the possibility of a vigorous reaction to water still.

Kim

Marjan

No there hasn't.

But I'ver heard that a completely new version is due soon, to cover the new regulations etc.

Kim

Terry

Yep you have to pay for the service.
Kim

PS

If it's something special or requires a lot of time to set up I them require 2 days. This generally pertains to years 11/12.

Kim

Anastasia I have a request form which I make all teacher use. If I don't get at least 24 Hrs they get northing unless they get it them selves. This has stood me in good stead particularly when there are 4 classes on at a time for the same year. In which case it's first in first gets equipment when t...

I've one better I can to this school 4 years ago, and upon opening the Pre-room door was confronted with a floor full of plactic trays with chemicals in them and I mean the whole floor and benchs, As they were used the teaching staff just kept adding more trays to trays. Many were potential life thr...

Hi

Oxalic acid does work, I make it faily strong and most is gone by the morning. I then reuse the solution many times.

Kim

PS Biurets is for detecting Protein

Kim

Jen

Benedict you must heat for it to work correctly.

Kim

Jen You can also use Benedict's Solution it only looking for the presents (not being quantative) of Glucose. It can be bought or you can make it your self very cheaply: 17.3g Copper Sulphate (hydrated) 100g Sodium Carbonate (anhydrous) 173g Sodium Citrate (hydrated) 1L Distilled Water Disolve the So...

Hi

Try a conc. solution of Pyroneg, its fairly agressive detergent, and soak for a day or too. I still like Chromic Acid for such things, but that a no no these days.

Kim

Hi again

In regard to MSDS's from Suppliers, almost all of them supply the full MSDS, as they are mandated to supply all information. I prefer the full, but its a bit much for Teacher's and Students.

The one pager seems to satisfy most of their needs, but not mine.

Kim

Thankyou Robyn for the % of coats size. This is a great help.

When you add the Bi Carb or carbonate do it in small amounts at a time, as suggested in the fumehood.

Kim

Just a quick question. What is the rough nos of sizes per class. As I'm not sure what to order next year as its not worth ordering just one size and hope you got it right.

Kim

Hi After doing a search in ChemGold (Advance Mode) you are presented with the result page and on the lefthand side you will see Mini MSDS, Summary, and MSDS. Each one gives you greater detail information. I have printed the Mini MSDS's and placed them into two folder so that in times of emergancy th...

Hi Annette Actually under WorkCover OH&S Regs and Code of Practices there should be signage for all sorts of things, not only exits, labelling etc. and the things already mentioned. Some equipment requires signage eg. Lasar light sources. Check out the CSIS Manual. If you have no signs or not su...

Dilute the Conc HCl to about 10-20% in plastic bucket then add Sodiun BiCarbonate. Lots of bubbles. Keep adding the BiCarb till no further bubbling.

Kim