#1 Science Forum For Lab Technicians

How odd, liquid egg whites in a pouch. Can I ask what the prac is ?. We do an egg prac where we dissolve the shell off then let them sit in different conc salt solutions.... is it similar?. If so I would love to know... dissolving the shell is absolute pain and if you go to far you actually destroy...

Hey all , been asked to make lots of 1cm cubes of hard boiled egg white for a enzyme prac . Never done this before so asking any handy hints . Apparently I need 40 cubes for each of the 3 classes . I'm thinking that is 100mm x 120mm x10mm = 120mls of egg white I'm going to get this stuff instead of ...

Hi everyone, Can someone please pass on an essay 0.1m Iron sulfate recipe. Thanks in advance It depends whether you have Heptahydrate of Anhydrous powder . There should be a Molecular Weight on the container . IE Anhydrous stuff should be MW 151.908 whereas the Heptahydrate should say MW 278.02 Thi...

I love that MrC
That is flash

Incidentally , using 10watt resistors , you wouldn’t actually need to use water ….. especially if you had 20 ohms @ 20 watts . However , the reason water is used is because the resistance of the resistor changes as it gets hot . By using water cooling , the resistor becomes an “Ohmic Resistor” meani...

Serrata are now owned by MTA . I made some water cooled resistors for my wife last year . I bought some screw lid jars from $2 shop and some banana sockets and resistors from Jaycar . EDIT : I just remembered Jaycar didn’t have enough resistors and sockets in the local store so I bought some from an...

Sooooo …..are we being too anal ….. or is the rest of the world too blasé

It apparently can effect unborn babies . Not a problem for males but girls could be unknowingly pregnant and that it the problem .Some schools use it in juniour school where it it highly unlikely there are any girls of child bearing age . Female teachers should be made aware that although its a teac...

Hydrogen peroxide cleans permanganate stains off right before your eyes . Fizz fizz fizz . Only need 6% stuff. Pour it in the flask ,swish it around for a minute . Pour it into the next , swish it around etc etc etc . Only need about 50mls and will do maybe 1/2 dozen flasks easy HCl will sort rust l...

Hi Rosalie Yes you can just use plain Agar .It’s one of the beauties of the dye .No more expensive Agarose powder . Also yes I used Bicarb soda as the electrolyte but I can’t remember the concentration . I could find out for you though . As for the dyes , the set I got had a little sticker on them s...

Rowanne wrote: ↑10 Sep 2024, 11:33 I cant figure out how to post a picture or link sorry

Hi Rowanne .
Pictures are can be added cua attachments .

See this topic I created
viewtopic.php?p=48860#p48860

Goldfish bowls

I’ve never found volume marks to be that good on most flasks or beakers in the first place . They are probably still good to use for titrations at least .

OK I just did it .$33 flat fee freight.
$77.55 for 3x Buffer tablets (4,7,10) and Freight .

Thanks Rosalie.
That's a great price . Haven't checked freight yet , but surely can't be more than $25 Haines wanted .

We had those Grey shallow trays at old school to Rosalie . Apparently they were Photographic development trays . I couldn't find the original ones for Love nor Money but I did find some Newer ones .They all had a small pourer on one corner . I thought they looked strange but the Bio teacher said it...

Hi Labbies . I've just realized all our Sparkvue pH probes are well out of calibration. I have also realized that we have no pH4 buffer solution . I have also just realized that Buffer solution has a limited shelf life 12-18 months unopened and less than 3 months when opened . At old school we had b...

When I was worrying like heck about how dangerous these batteries were , I did a bit of googling . Yes there have been a few cases of batteries catching fire . I watched a professor who specialises in Lithium batteries and his opinion was that yup , they can catch fire . But it is very rare . About ...

At my last school I was ITC one day a week . I quickly realised that the batteries in most of our Chromebooks were swollen up so much they were bulging up the keyboards and the keys were actually flicking off . LOL ….. I naturally blamed the kids at first until I changed a few keyboards and found th...

I tend to agree with Merilyn .
When running , ours has such an up draft , I've given up ever using the Bunsen's .Was similar at my old school .
I'd be getting the extractor fan checked out .

I would think the condensation from being in the fridge would make it run worse? That was my thoughts too Peter. Although by the time I've buggered around getting it all back together , it's usually dried out :cheesy: Does anybody store their belts in the Fridge ? I ask because when I did my hand o...