Australia's Science Forum

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...

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!!

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.

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

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.

You lucky thing - I love frogs too. Fortunately for me, I see a lot of frogs around here. Gorgeous!!

CRIKEY!!

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 ...

Check this out! So cool. https://www.theguardian.com/science/gal ... n-pictures

Also try https://www.sigmaaldrich.com/chemistry/ ... lator.html - it's brilliant

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...

Yeah swish it around quite forcefully. Sugar also works (it doesn't dissolve in the metho and the sharp edges abrade the residue).

Sand and metho. Or dishwashing powder (for dishwashers) and vinegar.

Wow, that's great. Shows it's wise to shop around.

Make sure you write down a big chunk of time for "doing pointless stuff requested by the principal".

I'm still getting the "file too large" error message too...

Hi there. Photos from my iPhone SE 2020 are "too big" to be posted to this site. Can this be fixed?

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...

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.

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...