Australia's Science Forum

If the 0.1 M uses 12.5mL of sulfuric, then 0.5M needs 62.5mL.
It is correct, right??
Lada

PS
I have been trying to be put on level 4, only to be told I will need to be a supervisor of other staff to be on lever 4.
Guess what, I am the only one here

Hi,
independent school.
750 students
level 3 (I have chemIV certificate from TAFE since 1974)
term only (wages averaged out for the year) plus 4 weeks holidays
37.5hrs per week science only
Lada

I make up 3-4% agar, so 15-20g into 500mL of water.
I dissolve agar in cold water and because we have an autoclave, I do not boil it. bring to about 70oC and put in autoclave.
11g should have set.
Lada

Love this site. Just got a request for strawberry ext. for DNA testing, bu t"sorry I don't know the method".
I just type in DNA in search window and walla, here it is.
Thanks, guys.
Lada

We have calcium granules and I keep them under paraffin. I feel safer doing it.
Krysia, I can give you some, but I am in Collaroy.
Lada

Sunray,
where did you work? I worked at electrolytic refining and smelting in Port Kembla.
Using heaps of HNO3 and copper shavings. I worked in QC lab.
L

If you use this method, make sure its done in fume cupboard. Copper with acid nitric will produce dense brown fumes.
L

Yes, we use dried yeast( just supermarket brand. One I have now is Tandaco from Coles. It contains 98% baker's yeast

I have used 20% alcohol pH about 3-4.5.
Don't throw it out, Curie

If not, they should be. They are the ones who want to do banned pracs and I have to insist that we cannot do it. eg lead oxide reduction with carbon. We now use copper oxide and get lovely coppery streaks of pure copper.
Lada

OMG,
I had no idea we are in the that category/ Where is our "danger money" that comes with this type of industry?
They cannot be serious!!
Lada

Pardon my ignorance, but what is LMBR&SAP ??!!
Lada

Thanks. I just had a talk with HOD about it, as we have 20plates" breeding" in an incubator. He agrees, but technically we are not DET school. All well and good, does it mean we can use any chemicals banned from DET schools? We must be held accountable for our actions? Very silly to segreg...

Hi Sue,
is there a document stating the ban in 2000? I cannot find it anywhere. One teacher here knows about it. It was introduced after one school has grown golden staph on plates from a toilet swab, yuck!!
Lada

I have 14 booked for today and having to make up 30 agar plates as well.. I told teachers yesterday after 2pm, not to book anymore for today, so it is 14 :w00t: . But that is unusual, normally I would have about 7-8 a day. Still, I would not change my job with anybody. :clap3: Have a great weekend. ...

Lorrae,
I think water, and weak salt solutions will increase the size of egg, but golden syrup or conc salt and sugar solutions will decrease the size.
Lada

Same as Narelle. Let teachers blame kids, if not cut exactly like they want it.
L

Not sure Sarah, if you have the right address
https:\\jr.<URL removed, see forum rules>/chemwatch.web

Sarah, I dont know if this will work for you, but try
Account: your old user name
User name: administrator
password: your old password but it is case sensitive (make sure you use the upper and lower case)
Good luck,
Lada