Search found 706 matches

by bigmack
13 Mar 2024, 12:36
Forum: Chemistry and Labware - General
Topic: Waste from Redox Reactions
Replies: 2
Views: 266

Re: Waste from Redox Reactions

They are both screaming heavy metal waste bottle to me .
Depending on how much you have to get rid of , I’d evaporate as much water out of it first ( in a fume hood)
I hate paying ti dump water :whistling2:
by bigmack
13 Mar 2024, 09:07
Forum: Sourcing Materials & Eq Repairs
Topic: Spring Balances
Replies: 14
Views: 6004

Re: Spring Balances

Which type were they macca , and where have they broken?

Totally agree Merilyn , what a stupid thing for the teacher to request …… or was it just kids doing what kids do
by bigmack
08 Mar 2024, 22:40
Forum: Safety with Chemicals
Topic: Standard Operating Procedure (SOP) for removal of chemicals
Replies: 10
Views: 653

Re: Standard Operating Procedure (SOP) for removal of chemicals

I dunno . We are a school Education is our main goal surely . I sometimes wonder if us Lab techs get so wound up in all the safety stuff that we actually miss the whole point of why the heck we are here . Mercury is not good . Sure , but it is also an amazing element with properties that no other el...
by bigmack
26 Feb 2024, 09:33
Forum: Biology, Physics...
Topic: Biology
Replies: 4
Views: 408

Re: Biology

Found it .
viewtopic.php?p=41246#p41246

20% Gycerol
80% Water
Stir in a smidgen of Bromothymol Blue or Methyl Orange powder to colour .
by bigmack
25 Feb 2024, 17:30
Forum: Biology, Physics...
Topic: Biology
Replies: 4
Views: 408

Re: Biology

I used to make up a small batch of dye for practicing . I can’t remember the exact mix , but the original dyes from Southern Biological had the recipe on them . IE , what % glycerol , water and the particular dye . Made up some agar wells and would place them in a petrie dishes and cover with water ...
by bigmack
23 Feb 2024, 10:41
Forum: Biology, Physics...
Topic: IEC Kundt's Tube Apperatus
Replies: 7
Views: 328

Re: IEC Kundt's Tube Apperatus

Another problem my wife had commented on was that the Students had found it difficult to relate the diagrams of Nodes and Anti-nodes in the IEC manual to the way the equipment was set up . IE the closed end in thebook was on the Left , while the apperatus is setup with the closed end on the right . ...
by bigmack
23 Feb 2024, 10:26
Forum: Biology, Physics...
Topic: IEC Kundt's Tube Apperatus
Replies: 7
Views: 328

IEC Kundt's Tube Apperatus

We bought one of these several years ago . The teacher said it did not work .Some results were OK on the Open tube tests but it was useless on the closed tube tests . At the time , I remembered realising that the speaker in it was really bad at low frequencies and next time , it was used with a bett...
by bigmack
22 Nov 2023, 16:46
Forum: Miscellaneous
Topic: Attachment - how to add
Replies: 2
Views: 2853

Re: Attachment - how to add

Hi Kimmy What kind if attachment are you trying to add ? If its a picture , here is a “how to” I posted a while back . Always remember that to add an attachment , you must click the “Full Editor & Preview “ button at bottom first. I forgot to add that very important step at the start of the inst...
by bigmack
12 Oct 2023, 09:58
Forum: Chemistry and Labware - General
Topic: Dresden ??? jar
Replies: 6
Views: 1119

Re: Dresden ??? jar

I would love to see a pic of the top and also of the rubber bung removed to have a better look at it but, I think the name is Dreschel Bottle It also seems to be called a Dressel bottle and a Drechsler bottle It is a Gas washing Jar as far as I can tell . Drechsler.jpg The inverted level marks I thi...
by bigmack
11 Oct 2023, 12:46
Forum: Chemistry and Labware - General
Topic: Dresden ??? jar
Replies: 6
Views: 1119

Re: Dresden ??? jar

Its a curly one mtg. The upside down measurements are unique. I even tried putting it into google image search. Best I could find was an image on something similar .It was used in early Blood transfusions .May not even be close . IMG_8863.jpeg I found a similar new glass product called a glass buffe...
by bigmack
11 Oct 2023, 10:38
Forum: Forum Support Desk
Topic: How to post a picture on Chemtalk
Replies: 8
Views: 7016

Re: How to post a picture on Chemtalk

If you are posting Pics from an Iphone , you will still need to resize pics first .( I'm sure there would be an android version too) I have a free app called "resize It " .It is also handy for rotating pics that appear sideways when you post them . The trick for sideways pic is to click o...
by bigmack
05 Oct 2023, 10:58
Forum: Forum Support Desk
Topic: How to post a picture on Chemtalk
Replies: 8
Views: 7016

Re: How to post a picture on Chemtalk

If you are posting Pics from an Iphone , you will still need to resize pics first .( I'm sure there would be an android version too) I have a free app called "resize It " .It is also handy for rotating pics that appear sideways when you post them . The trick for sideways pic is to click on...
by bigmack
05 Oct 2023, 10:47
Forum: Chemistry and Labware - General
Topic: Dresden ??? jar
Replies: 6
Views: 1119

Re: Dresden ??? jar

Here's one I prepared earlier mtg :thumbup: How to post a Pic on Chemtalk Forum Don't forget the bit about Clicking "Full Editor and preview " button first . EDIT: Was wondering if it maybe a Leyden Jar you were thinking of ? The very old ones were Glass ,foil or metal on outside .Either f...
by bigmack
07 Sep 2023, 10:15
Forum: Announcements
Topic: Short term job in Queensland
Replies: 3
Views: 1373

Re: Short term job in Queensland

Thanks Labbie .Alas it’s a bit too far south than me .
by bigmack
24 Aug 2023, 19:33
Forum: Chemistry and Labware - General
Topic: Chemical disposal
Replies: 3
Views: 990

Re: Chemical disposal

Welcome to Chemtalk Briony.....First post . Glad to see the Good Ship MHS is in good hands and you are keeping the Bastards honest :D SAM must have been wondering why I had been stockpiling so many Chemicals :cheesy: ....I don't think we even had 1/2 a tonne all up . Even a prorata of 500kg for $5k ...
by bigmack
04 Aug 2023, 18:56
Forum: Sourcing Materials & Eq Repairs
Topic: refraction semi circles
Replies: 5
Views: 1164

Re: refraction semi circles

Anna Z wrote: 04 Aug 2023, 15:20 Could you borrow them from another school whilst waiting on ordering them ?
LOL, I remember being asked to buy these . Then they never got used . I know one school that has them sitting there doing nothing .
by bigmack
04 Aug 2023, 11:39
Forum: Chemistry and Labware - General
Topic: Year 10 DNA Pracs.
Replies: 24
Views: 9267

Re: Year 10 DNA Pracs.

We did Rosalie , but maybe our kids were too aggressive as we only got one reuse out of them before they started blowing out at the edges . In the end , Head Teacher said not to reuse them .
by bigmack
27 Jul 2023, 14:56
Forum: Chemistry and Labware - General
Topic: Ammonium Phosphate?
Replies: 12
Views: 4157

Re: Ammonium Phosphate?

Bit late to the party , but to answer the OPs question , di-Ammonium phosphate is what is used in wine making and in distilleries . It is commonly called DAP .
by bigmack
28 Jun 2023, 12:33
Forum: Chemistry and Labware - General
Topic: A suitable demo?
Replies: 10
Views: 1790

Re: A suitable demo?

Sometimes you just have to have a go and see how bad can it be .Nobody said “don’t try this it at home “ so he we go. Half a teaspoon of Salt and 5mls of Metho .Stirred in a standard old Drinking glass , not even a borosilicate Beaker , it may crack . IMG_8203.jpeg Lighting stick? Guess thats a safe...
by bigmack
22 Jun 2023, 21:57
Forum: Miscellaneous
Topic: Teachers
Replies: 3
Views: 2234

Re: Teachers

judy2018 wrote: 22 Jun 2023, 10:59 Hi All
Do teachers have to do a RISK ASSESSMENT for all EXPERIMENTS ?
Thank you
Judy
In NSW , as long as they follow the requirements of the CSIS , then they are .