Search found 199 matches
- 24 Jun 2021, 11:45
- Forum: Safety with Chemicals
- Topic: Potassium Permanganate Disposal
- Replies: 9
- Views: 6229
Re: Potassium Permanganate Disposal
Googled this - MnO4−(aq)+H2O2(aq) = Mn2+(aq)+O2(g) It did say it needed to be an acidic environment, so the vinegar was important. I saw someone put vitamin C in KMnO4 and it went colourless. I think this is also the KMnO4 being reduced to Mn ions. I'm still not convinced I need to do anything other...
- 02 Jun 2021, 09:07
- Forum: Safety with Chemicals
- Topic: Potassium Permanganate Disposal
- Replies: 9
- Views: 6229
Re: Potassium Permanganate Disposal
Here's something from RiskAssess - "permanganate cation is highly toxic to aquatic life, but reacts in sewer with organic matter to form Mn(II) and MnO2".
So I just chuck it down the sink with some water!!
So I just chuck it down the sink with some water!!
- 02 Jun 2021, 09:02
- Forum: Sourcing Materials & Eq Repairs
- Topic: Spectral lamps
- Replies: 6
- Views: 3236
Re: Spectral lamps
Definitely don't put the mercury one in the bin! That would need to be disposed of as hazardous waste (picked up for disposal by Veolia or whoever). I'd ring my local council and see if they can be disposed of like light globes.
- 19 May 2021, 08:42
- Forum: Sourcing Materials & Eq Repairs
- Topic: Repairs to Science equipment
- Replies: 37
- Views: 46607
Re: Repairs to Science equipment
We had Bob Death come out and fix a whole lot of stuff. Very happy with him. I think he does most of NSW. 0416 721 011
- 19 May 2021, 08:25
- Forum: Safety with Chemicals
- Topic: Disposal of the Octanoic and Decanoic acid
- Replies: 9
- Views: 3434
Re: Disposal of the Octanoic and Decanoic acid
Call your local water supply company and see if they have any guidelines. Maybe also contact the EPA. Are you subscribed to ScienceAssist? Therese Gigengack from ScienceAssist has been very helpful to me in the past regarding chemical disposal.
- 09 Mar 2021, 07:04
- Forum: Sourcing Materials & Eq Repairs
- Topic: Sourcing of frozen cane toads
- Replies: 14
- Views: 4081
Re: Sourcing of frozen cane toads
You lucky thing - I love frogs too. Fortunately for me, I see a lot of frogs around here. Gorgeous!!
- 02 Mar 2021, 08:23
- Forum: Sourcing Materials & Eq Repairs
- Topic: Sourcing of frozen cane toads
- Replies: 14
- Views: 4081
Re: Sourcing of frozen cane toads
CRIKEY!!
- 25 Feb 2021, 05:43
- Forum: Sourcing Materials & Eq Repairs
- Topic: Sourcing of frozen cane toads
- Replies: 14
- Views: 4081
Re: Sourcing of frozen cane toads
I live in the Northern Rivers NSW, and we're inundated with the bloody things. Catch them in a trap (half-full bucket of water) or by hand, put them in the fridge overnight to send them into aestivation then whack them in the freezer to kill them. My record is 20 in one night, which just shows what ...
- 10 Feb 2021, 08:28
- Forum: Biology, Physics...
- Topic: Art in a petri dish
- Replies: 3
- Views: 5915
Art in a petri dish
Check this out! So cool. https://www.theguardian.com/science/gal ... n-pictures
- 10 Feb 2021, 08:26
- Forum: Chemistry and Labware - General
- Topic: 0.0001M HCI
- Replies: 3
- Views: 2383
Re: 0.0001M HCI
Also try https://www.sigmaaldrich.com/chemistry/ ... lator.html - it's brilliant
- 10 Feb 2021, 06:18
- Forum: Chemistry and Labware - General
- Topic: 0.0001M HCI
- Replies: 3
- Views: 2383
Re: 0.0001M HCI
No is the short answer. 0.0001M HCl is a much more dilute concentration than 0.1M. How much do you need to end up with? I'll do the calculations and let you know. For example, if you need 100mL of 0.0001M HCL, take 1mL of 0.1M HCl and add to 9mL distilled water to create 10mL of 0.01M HCl. Do this t...
- 02 Feb 2021, 09:12
- Forum: Chemistry and Labware - General
- Topic: How can I clean volumetric flasks?
- Replies: 15
- Views: 7865
Re: How can I clean volumetric flasks?
Yeah swish it around quite forcefully. Sugar also works (it doesn't dissolve in the metho and the sharp edges abrade the residue).
- 02 Feb 2021, 06:32
- Forum: Chemistry and Labware - General
- Topic: How can I clean volumetric flasks?
- Replies: 15
- Views: 7865
Re: How can I clean volumetric flasks?
Sand and metho. Or dishwashing powder (for dishwashers) and vinegar.
- 11 Nov 2020, 11:39
- Forum: Sourcing Materials & Eq Repairs
- Topic: Trolleys
- Replies: 2
- Views: 1826
Re: Trolleys
Wow, that's great. Shows it's wise to shop around.
- 10 Nov 2020, 11:06
- Forum: The Lab Tech Position
- Topic: How do I describe what I do?
- Replies: 49
- Views: 42744
Re: How do I describe what I do?
Make sure you write down a big chunk of time for "doing pointless stuff requested by the principal".
- 10 Nov 2020, 10:55
- Forum: Forum Support Desk
- Topic: Photo files too big for chemtalk
- Replies: 8
- Views: 7801
Re: Photo files too big for chemtalk
I'm still getting the "file too large" error message too...
- 05 Nov 2020, 11:22
- Forum: Forum Support Desk
- Topic: Photo files too big for chemtalk
- Replies: 8
- Views: 7801
Photo files too big for chemtalk
Hi there. Photos from my iPhone SE 2020 are "too big" to be posted to this site. Can this be fixed?
- 05 Nov 2020, 10:27
- Forum: The Lab Tech Position
- Topic: Science Assistant Training
- Replies: 9
- Views: 13596
Re: Science Assistant Training
Do you have access to RiskAssess regarding chemical disposal? If not, don't put mercury, cobalt, copper, lead, or zinc compounds down the sink. Also keep for specialist disposal chromate/dichromate and fluoride compounds and all halogenated and non-halogenated organic chemicals. Keep them in separat...
- 04 Aug 2020, 12:52
- Forum: Recipes and Pracs
- Topic: iron standard solutions
- Replies: 6
- Views: 3423
Re: iron standard solutions
Oh yes! My mistake. It should be 0.0050 x 5, not 500. Thank you, Wayne. That'll teach me for doing calculations first thing in the morning.
- 04 Aug 2020, 08:02
- Forum: Recipes and Pracs
- Topic: iron standard solutions
- Replies: 6
- Views: 3423
Re: iron standard solutions
Hi Kathryn. I think you work this out as follows. I will assume the percentage is weight of solute/weight of solution. Start with your desired volume of solution. If you need 500mL of each, for example, each solution will weigh 500g. Then multiply the weight of the solution by the percentage require...