Search found 405 matches

by mtg
11 May 2022, 16:55
Forum: Chemistry and Labware - General
Topic: double fume hoods
Replies: 5
Views: 2316

Re: double fume hoods

Mine is double and sort of adjacent to the class sitting area, so the kids are looking the other way, then when they do a prac requiring fume hood they come over to the fume hood, the teachers demo bench is on castors and can be moved so the kids can see what's happening. Not a problem unless it is ...
by mtg
21 Mar 2022, 10:40
Forum: Safety with Chemicals
Topic: Risk Assessment
Replies: 44
Views: 13951

Re: Risk Assessment

I have copied smiley's post to show my HOD, I am struggling to get staff to all use riskassess. I absolutely love it for my labelling. The only problem is the lack of predictive text. Having to type in the whole word when you put in the equipment required etc.
by mtg
21 Mar 2022, 10:32
Forum: Sourcing Materials & Eq Repairs
Topic: 12V Lamp globes
Replies: 7
Views: 1596

Re: 12V Lamp globes

wiltronics
by mtg
07 Mar 2022, 10:58
Forum: Recipes and Pracs
Topic: normal acetic acid
Replies: 2
Views: 1412

Re: normal acetic acid

labbassistant wrote: 07 Mar 2022, 10:54 That's what I would guess.
Normal vinegar is 4-6% and also equals to 1M, and for dilute I'd probably go 0.1M
Have you asked them what they actually want?
I know what they probably want, I'm just being annoyed at stupid pracs. :-|
by mtg
07 Mar 2022, 10:55
Forum: Miscellaneous
Topic: Let’s talk fridges!
Replies: 3
Views: 1351

Re: Let’s talk fridges!

I have a fridge freezer, but would love a bigger freezer section, and a bar fridge for anything the kids will put in their mouths, straws, cotton buds etc. and my food. During covid we had to live and work as alone as possible, so I still use it for my stuff.
by mtg
07 Mar 2022, 10:44
Forum: Sourcing Materials & Eq Repairs
Topic: Wanting to purchase
Replies: 15
Views: 5291

Re: Wanting to purchase

I found it. It was in a box I hadn't yet put up high. Is this what you are looking for? This looks like it would only hold about 250ml. What would you use this for? I have distillation set ups, but we dont use a flask like this. Curious, it is a lovely little flask. I have a heap of the big golf cl...
by mtg
07 Mar 2022, 10:40
Forum: Sourcing Materials & Eq Repairs
Topic: Wanting to purchase
Replies: 15
Views: 5291

Re: Wanting to purchase

macca wrote: 04 Mar 2022, 11:15 Hi, it's FRIDAY!!!

Can anyone tell where I could purchase a 19/26 500ml short neck round bottom flask from? I've searched my normal suppliers with no luck.
Maybe Haines, they made up my quick fit as the size we use was no longer available. They have 19/26 but not sure if they have a flask.
by mtg
07 Mar 2022, 10:32
Forum: Recipes and Pracs
Topic: normal acetic acid
Replies: 2
Views: 1412

normal acetic acid

I have a year 10 prac which asks for "Normal Acetic acid" and 'Dilute Acetic acid', never had this before, I am guessing concentrate glacial acetic acid is not what the teacher wants, but I am tempted. What would you suggest? Factors which effect the rate of reaction. ((Possibly vinegar an...
by mtg
07 Mar 2022, 09:20
Forum: Safety with Chemicals
Topic: Radioactive Rocks
Replies: 6
Views: 1507

Re: Radioactive Rocks

I want some. My radioactive sources freaked me out when I first started so I contacted the Melb Uni, some boffins came and took them away. Now all I have is smoke alarms and the residual readings from dirt etc. It is worth studying what strength and sort of radioactive waves/isotopes you have. Most ...
by mtg
02 Mar 2022, 09:09
Forum: Chemistry and Labware - General
Topic: MAKING A COMPOUND
Replies: 5
Views: 3043

Re: MAKING A COMPOUND

RosalieL wrote: 24 Feb 2022, 09:05 At my old school they would have a Bunsen underneath (no gauze mat, just the triangle) and one aimed in the top with the lid held half on ready to just place down when it lit. Team effort and I’m pretty sure it was only seniors.
Glad I am not the only one Rosalie. Thank you.
by mtg
02 Mar 2022, 09:07
Forum: Safety with Chemicals
Topic: Flame test kits
Replies: 64
Views: 23409

Re: Flame test kits

I just read this thread again and after 30 years of doing flame tests realised saturated solutions are the go. I have been cleaning bunsens since the last flame test prac where the kids drop salts into the turret and block the jet.
by mtg
23 Feb 2022, 14:18
Forum: Chemistry and Labware - General
Topic: MAKING A COMPOUND
Replies: 5
Views: 3043

Re: MAKING A COMPOUND

I am going to just repeat what I have said for a few years, we cannot get the magnesium ribbon to burn, been going for the entire lesson, but alas it will not become MgO, it confounds me as we used to do it every year and it worked. Lift the lid off a bit, loose coil in the bottom of a crucible, big...
by mtg
23 Feb 2022, 14:11
Forum: Recipes and Pracs
Topic: barium nitrate solution.
Replies: 6
Views: 1903

Re: barium nitrate solution.

Thanks I will go with the 0.1M, but why would The Laboratory give bench strength that clearly doesn't work? I did double check with another book and it also gave 0.5M.
by mtg
21 Feb 2022, 15:06
Forum: Recipes and Pracs
Topic: barium nitrate solution.
Replies: 6
Views: 1903

barium nitrate solution.

The Laboratory shows 0.5M is bench strength for Barium Nitrate, but at that strength (130.50g per litre) it wont dissolve. I have a prac for year 10 which requires Barium Nitrate solution. No recipe.No strength. help.
by mtg
17 Feb 2022, 09:28
Forum: Chemistry and Labware - General
Topic: aluminium potassium sulfate from westlab
Replies: 8
Views: 1826

Re: aluminium potassium sulfate from westlab

I just grabbed out an old MSDS. It says it contains Sulphuric acid, (composition: Sulphuric acid, Aluminium Potassium salt ) it also says hazardous. Mallinckrodt chemicals USA. WARNING harmful if swallowed or inhaled, causes irritation to skin, eyes and respiratory tract. Avoid contact with eyes, sk...
by mtg
17 Feb 2022, 09:14
Forum: Sourcing Materials & Eq Repairs
Topic: Storing electrical leadsl
Replies: 4
Views: 1680

Re: Storing electrical leadsl

I gave up and chucked them all into a tub. :(
by mtg
17 Feb 2022, 09:12
Forum: Sourcing Materials & Eq Repairs
Topic: free delivery of equipment/chems.
Replies: 3
Views: 1103

Re: free delivery of equipment/chems.

I shop around, for example Nisbets for trolleys, but Westlab have really upped their game. I ran a little PD day for local lab techs a couple of years ago and a Westlab rep came all the way out (in country Victoria) to do demos and answer our questions. Always worth a quick chat to Sales. They have ...
by mtg
17 Feb 2022, 09:04
Forum: Chemistry and Labware - General
Topic: Hot Equipment
Replies: 4
Views: 962

Re: Hot Equipment

Same as everyone else. I do have heat proof gloves and some pracs require them. Heating metal rods if they have to change them for example. Or doing multiple pracs in a row if they have to move stuff.
by mtg
16 Feb 2022, 10:44
Forum: Sourcing Materials & Eq Repairs
Topic: free delivery of equipment/chems.
Replies: 3
Views: 1103

free delivery of equipment/chems.

I needed to get some equipment and chemicals for a prac urgently. Ended up doing 2 orders to Westlab. Rang to get them on the same delivery, (free over $100 online orders), but the 2nd delayed delivery confirmation email showed a delivery charge, a quick phone call and the delivery charge was immedi...
by mtg
08 Feb 2022, 09:35
Forum: Safety with Chemicals
Topic: Taking Mercury to the class room
Replies: 19
Views: 6739

Re: Taking Mercury to the class room

I understand. I have never had a spill in over 30 years, I had a teacher play with it back in the early 90's, and had broken thermometers etc. you can put a powder over it and suck it up. As I understand it, it vapourises at room temp and is absorbed thru' the skin. We are all wearing masks and we d...