Australia's Science Forum

The slide rheostats we have around 11 ohms . If connected to a 5watt bulb there will be some slight dimming from one end to the other . If we use them on 35 watt bulbs , they go from full on and dim over the full length of the slider ....they are a good match for this type of demo . A 10k Pot will a...

Thanks Merilyn yeah I was wondering because denatured is way cheaper to buy and I didn't want to waste my precious Why do you have 20L? It has always been in the flammables cupboard . There's only 15 odd litres left in it now . Stuffs worth an arm and a leg so no way am I giving it up :crazy: You go...

Hi all . Just made a batch of Universal indicator ( pH4-10 ) 0.025g thymol blue 0.0625g methyl red 0.5g phenolphthalein 0.25g bromothymol blue 500ml ethyl alcohol (ethanol) adjust to green with sodium hydroxide dropper I used Absolute Ethanol as we have a 20 liter drum of it but I was wondering can ...

I just received some flyers from Haines and they are selling one that looks exactly the same, doesn't state brand. Costs $450. Yes that's the one I used .Wondered who stocked them . It's very similar to the one I linked two but can't find specs to compare . I know the Home Brew shop sells them for ...

Hi Kathryn It was already there so I don't know where it came from but they are available from any Home Brew shops . There's a contact number in the link https://stillspirits.com/products/turbo-air-still AU: 1800 281 231 (free phone) Note that it says you need carbon filters and stuff ...that's only...

Tap water normally contains a lot of natural minerals depending on the source . Local municipals add chemicals at the water treatment stations to adjust the pH so it is close to 7.

And yes , because distilled water has no minerals in it , it is easily acidified by the CO2 in the air

I used one of these at a school I worked at last year . Its an Air Still . You fill it up with about 2 liters of water , turn it on and it just sits there all day dribbling out distilled water . After 4-5 hours it auto switches off . No cooling water required . It consumes about 350 watts. So basica...

That sounds like a great way to demo it Merilyn .Can imagine the melting hot thermite dripping out the bottom of the tuna can :crazy: The ceramic planter pot method .... you fill it with sand .... dry sand :thumbup: Sand helps contain the heat from the reaction .... safety thing , like the ceramic p...

Sounds like a thermite reaction with Aluminium powder and Iron oxide powder . Start it off with a bit of magnesium ribbon .

LOL ... well as luck would have it , my offsider came in and asked what was the container of disinfectant doing ? I explained and he said no way was I dumping it . I said it was 18 years out of date .... none the less , he took it home .... waste not , want not apparently .

LOL , I don't even know what I get ...but my Mrs says it more than I earn as a TV technician on the days I don't work as a Labbie

How much is in it? My SDS for the QAC we use says small amounts can be flushed to sewer. If it is a large container, 5L+, There's about 1.5 liters left. Been checking Chemwatch and a few SDS's for it said it was nasty to dispose of down the drain ...typical conflicting info . Why isn't it in CCSC M...

:redcard: How is this all coming along :redcard: Just informated its being Dumped, about _____________________ time. Where do you get your inside info from Labbie ? This weeks Email from the secretary was saying how stage 4 was about to be rolled out in November....you would kinda wonder why they w...

I'm lucky in that there are 2 large glass sealed tubes of NO2 that someone made over 20 years ago when it was last in the syllabus. Same here fibreweb Ours definitely look professionally made . I asked my off-sider where they come from . He said they were here when he started 25 years ago . If they...

Any possibility of seeing how and what words you guys put in your PDP's EG How do you put your ideas into an acceptable sentence ? .....I know its a strange question but I still don't know exactly how I'm meant to fill the template out :crazy: Anyone care to scan theirs ( name etc blanked out ) just...

LOL , its 18 years old Labbie .
Doh , didn't even think about Chemwatch .
That can be tomorrows problem..... thanks

Just been given a container of "Gemex" to dispose of from Home science . Says it contains Quarternary Ammonium Compounds which googling also would suggest it as Benzalkonium Chloride, SDS sheets for either if these doesn't say anymore than dispose of as per local rules .( why do SDS sheets...

Thanks to Maria . Part number 1152100 Unfortunately they are awaiting stock Well my Silicone teats turned up from Serrata. been busy last term replacing the more corrosive droppers . Even put GHS labels on them while I was at it :whistling2: Anyway. come in today and went to top up the 1M sodium hy...

Yah !

Thanks Westlab

Tried Yammer and the Asetnsw email thing .OMG ...that drove me nuts . This forum is so much better . Pleased all the Database didn't get lost when Chemtalk pulled the Pin

Thanks to Maria .

Part number 1152100

Unfortunately they are awaiting stock