Search found 696 matches

by bigmack
14 Mar 2024, 22:12
Forum: Biology, Physics...
Topic: IEC Kundt's Tube Apperatus
Replies: 7
Views: 301

Re: IEC Kundt's Tube Apperatus

Well actually it was an eye opener for me . And iff’n IEC are following this , there were a few extra issues I had not encountered . Noise . Firstly , Electrical noise . Now , some of you may be aware that for many years I was a TV Technician and using Oscilloscopes was a daily thing . Well , I was ...
by bigmack
14 Mar 2024, 16:23
Forum: Biology, Physics...
Topic: frozen hearts - help!
Replies: 10
Views: 238

Re: frozen hearts - help!

I used to pull hearts from the freezer and stick them in a sink of warm water and they would be ready in an hour ir so . However , I think they would be fine if you just left them in cold water overnight . . Stick them back in the fridge when you get in , in the morning until needed. Not had to defr...
by bigmack
14 Mar 2024, 10:56
Forum: Biology, Physics...
Topic: IEC Kundt's Tube Apperatus
Replies: 7
Views: 301

Re: IEC Kundt's Tube Apperatus

Thanks Labbie.

Well the time has come . Today Mrs Bigmack was planing to use the Kundt’s tube but after much disappointment , she still doesn’t trust it …. so , she has asked me to come and help run the prac .
Hopefully she will see that it works .
by bigmack
13 Mar 2024, 13:40
Forum: Biology, Physics...
Topic: IEC Kundt's Tube Apperatus
Replies: 7
Views: 301

Re: IEC Kundt's Tube Apperatus

I worked out how to get the Two holes thing to work to demonstrate how a wind instrument such as a Recorder or flute works . I've also basically written a whole new operating Manual so that a teacher may follow it and get some meaningful results complete with printable work sheets that students can ...
by bigmack
13 Mar 2024, 12:43
Forum: Recipes and Pracs
Topic: Help please - High conc. CuSO4 / Cu(NO3)2 solutions
Replies: 3
Views: 265

Re: Help please - High conc. CuSO4 / Cu(NO3)2 solutions

I agree with Elizabeth .
I have never been asked for anything higher than 0.5 - 1mol/l for galvanic cell pracs .

I wonder if teacher has given you a typo
by bigmack
13 Mar 2024, 12:36
Forum: Chemistry and Labware - General
Topic: Waste from Redox Reactions
Replies: 2
Views: 213

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: 5929

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: 497

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: 379

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: 379

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: 301

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: 301

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: 2552

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: 987

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: 987

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: 6538

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: 6538

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: 987

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: 1206

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: 881

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 ...