OK Robb
Your the Genius, I don't have time to play
How do you go about putting scanded image in here as a post
Maybe this is in the wrong place!
but "all knowledge is good"
Search found 646 matches
- 20 Jun 2008, 10:06
- Forum: Chemistry and Labware - General
- Topic: Bromothymol blue
- Replies: 8
- Views: 3285
- 20 Jun 2008, 09:43
- Forum: Chemistry and Labware - General
- Topic: Bromothymol blue
- Replies: 8
- Views: 3285
Re: Bromothymol blue
I have a chart I find most helpful tried to scan it and insert in here but don't think it worked, anyway worth the try
- 20 Jun 2008, 09:01
- Forum: Chemistry and Labware - General
- Topic: Calcium sulfate - ppt???
- Replies: 17
- Views: 5667
Re: Calcium sulfate - ppt???
G'Day Pam
Is that a note of sarcasm I detect
Is that a note of sarcasm I detect
- 19 Jun 2008, 08:57
- Forum: Chemistry and Labware - General
- Topic: Calcium sulfate - ppt???
- Replies: 17
- Views: 5667
Re: Calcium sulfate - ppt???
You Got it!
- 18 Jun 2008, 13:52
- Forum: Chemistry and Labware - General
- Topic: Calcium sulfate - ppt???
- Replies: 17
- Views: 5667
Re: Calcium sulfate - ppt???
Forgot to mention! my reagent bottle looks Brown as xxxx but when you tip it sideways liquid inside is green
- 18 Jun 2008, 13:48
- Forum: Chemistry and Labware - General
- Topic: Calcium sulfate - ppt???
- Replies: 17
- Views: 5667
Re: Calcium sulfate - ppt???
Acidifing turns it green, but can affect reactions.
- 18 Jun 2008, 09:14
- Forum: Chemistry and Labware - General
- Topic: Swan neck glass tubes???
- Replies: 27
- Views: 8803
Re: Swan neck glass tubes???
When I suggested the air locks the Bio teachers didn't like it, because they use pice of glass bent in swan neck and straight pice in other flask half fill with chicken broth then boil both the one without airlock bend should grow mould. This year had failure, on investigation reading label of chick...
- 13 Jun 2008, 14:51
- Forum: Chemistry and Labware - General
- Topic: Calcium sulfate - ppt???
- Replies: 17
- Views: 5667
Re: Calcium sulfate - ppt???
try putting a Iron nail or two in reagent bottle of Iron ll Sulfate this keeps it as Iron ll
If left without nail, it reverts to Iron lll
If left without nail, it reverts to Iron lll
- 04 Jun 2008, 11:50
- Forum: Chemistry and Labware - General
- Topic: Dropper bottles
- Replies: 15
- Views: 5845
Re: Dropper bottles
Got the sthul dropper bottles labeled and filled then did trial. The teacher could not undo screwed whole top off, so I went along and tightened every top and uopened dropper top and tested each one some you just touch and they squirt ( often at an oblique angle ), adjust back slightly and nothing c...
- 27 May 2008, 09:30
- Forum: Chemistry and Labware - General
- Topic: Dropper bottles
- Replies: 15
- Views: 5845
Re: Dropper bottles
Hey Pkij
Besides the obvious, Silver Nitrate Pot. Permanganate & Iodine what other stuff reacts with plastic bottles,
I don't want to re-invent the wheel
Thanks Ocker
Besides the obvious, Silver Nitrate Pot. Permanganate & Iodine what other stuff reacts with plastic bottles,
I don't want to re-invent the wheel
Thanks Ocker
- 26 May 2008, 09:12
- Forum: Announcements
- Topic: Making lead by heating Pb O with carbon
- Replies: 10
- Views: 3083
Re: Making lead by heating Pb O with carbon
Hey Rainbow
Was just reminising about the Pb O prac last week at the chemwatch In-service
Relating story about a certain teacher who forgot to immerse carbon blocks in water later that night they spontanously combusted from that day on known as "torch"
Graeme
Was just reminising about the Pb O prac last week at the chemwatch In-service
Relating story about a certain teacher who forgot to immerse carbon blocks in water later that night they spontanously combusted from that day on known as "torch"
Graeme
- 23 May 2008, 13:30
- Forum: Chemistry and Labware - General
- Topic: Dropper bottles
- Replies: 15
- Views: 5845
Re: Dropper bottles
Thank'severyone have 250 Stulle bottles on order. Will trial them for Yr 12 Prac.exam. I'm concerned about Lada's comment about tops freezing and having whole top screw off, as I asaid before as soon as kids go into exam they leave their brains in the bag. Maybe if I wrap plummers teflon tape around...
- 08 May 2008, 14:13
- Forum: Chemistry and Labware - General
- Topic: Dropper bottles
- Replies: 15
- Views: 5845
Dropper bottles
We always have a problem with kids putting wrong droppers back in bottles when doing precipitation reaction prac exams, even after colour coding droppers and bottles. It seems once they start a prac exam everything they have been taught goes out the window. however modern eyedrops always come in squ...
- 13 Feb 2008, 13:43
- Forum: Chemistry and Labware - General
- Topic: Pipette Fillers
- Replies: 4
- Views: 1650
Pipette Fillers
I have to order some new 3 valve pipette fillers the others are all perished,as soon as kids suck acid up into them they start to perish. I have some old black rubber ones, that never perish must be made with acid resistant nitrial rubber. can anyone tell me where to obtain some more of these, only ...
- 18 Dec 2007, 11:13
- Forum: Sourcing Materials & Eq Repairs
- Topic: Gieger Counter
- Replies: 1
- Views: 983
Gieger Counter
I have a Gieger counter manufactured by D of E Workshops NSW
Now experiencing difficulties with it, Physics teacher is sure probe is cracked/broken
Can anyone recommend where a new probe might be sourced
Now experiencing difficulties with it, Physics teacher is sure probe is cracked/broken
Can anyone recommend where a new probe might be sourced
- 03 Dec 2007, 10:10
- Forum: Chemistry and Labware - General
- Topic: PH meters
- Replies: 13
- Views: 4864
Re: PH meters
pH probes have limited life (2 to 3 years normal)
Doyou have any data loggers this is the best when probes refuse to be calibrated at the end of their life just replace probe you still have interface and datalogger
Doyou have any data loggers this is the best when probes refuse to be calibrated at the end of their life just replace probe you still have interface and datalogger
- 24 Sep 2007, 12:09
- Forum: Safety with Chemicals
- Topic: Chemwatch Issues
- Replies: 48
- Views: 15962
Re: Chemwatch Issues
Hey pommy
I always thought Chemwatch on net was too slow for Labels /MSDS etc
So conned Dept head to purchase Chemwatch on disc $80 / year 4 upgrades every 3 months
I always thought Chemwatch on net was too slow for Labels /MSDS etc
So conned Dept head to purchase Chemwatch on disc $80 / year 4 upgrades every 3 months
- 24 Sep 2007, 11:42
- Forum: Chemistry and Labware - General
- Topic: Testing the "freshness" of acidified Potassium Dichromate
- Replies: 15
- Views: 5751
Re: Testing the "freshness" of acidified Potassium Dichromate
Hey Barb / Hippy
It's only good for about a week1
Just take Dropper bottles off shelf add 1 drop Sulphuric then after everyone's finished Ditch
( tech term ) and make new
It's only good for about a week1
Just take Dropper bottles off shelf add 1 drop Sulphuric then after everyone's finished Ditch
( tech term ) and make new
- 24 Sep 2007, 11:34
- Forum: Sourcing Materials & Eq Repairs
- Topic: Bunsen Burners
- Replies: 29
- Views: 9207
Re: Bunsen Burners
Use round bar or screwdriver shaft to unscrew, if Jet comes out as well warm in flame and use two pair of pliers to unscrew Jet use Flat fine file till top of jet is shiney then borrow Oxy/Acet. Jet cleaners from industrial arts section and run these in & out hole in jet
- 24 Sep 2007, 11:20
- Forum: Chemistry and Labware - General
- Topic: Normal solution (N)
- Replies: 9
- Views: 3818
Re: Normal solution (N)
A Normal Sol'ncontains the gram equivalent of the dissolved substance in a litre
But to be specific with H Cl 1M = N with Sulphuric 1M = 2N Don't try to run with it Just get out of trouble without looking a bit silly
But to be specific with H Cl 1M = N with Sulphuric 1M = 2N Don't try to run with it Just get out of trouble without looking a bit silly