Australia's Science Forum

Hi
This is how I work it out
Concentration of carbonate times Volume of carbonate times 2 divided by Volume of HCl equals Concentration of HCl
Hope this helps
Debbie

Hi
I think the methyl orange end point is hard to see so a mixed indicator is worth a try. Who supplies Xylene Cylanol?I cant find it in Q stores or Serrata catalogues.
Debbie

Hi Jazz
I wait until I have 3 or 4 that need a wash and then take them home.
You might have a washing machine and dryer at school in the TAS dept.
You could use that.
Debbie

Phil Jones sometimes goes to the St Mary's Conference. If you are going you could ask him if would run a course closer to home for you or just send him an email.
I have always found him helpful and easy to talk to. Email info@logint.com.au
Debbie

Thanks for your replies. The expiry list by Robb is good.
I guess I'll keep using the old indicators (including the ones from Peking Chemicals) and just replace one or two a year to refresh the stock.
Debbie

Hi Does anyone know how long you can keep indicator powder for. We have some that has been here for at least 10 years. Does it have a use by date? A recent recipe for making up litmus solution said to use anywhere between 1 to 10 g of indicator per Litre of water,depending on how old it was. How old...

The NSW DET put out a book callled Working in Science. On p43 there is a section on graduation marks.This is for burettes, grad measuring cylinders and thermometers "make a paste of barium sulfate in Indian ink.This paste is rubbed into the marks and the excess removed with a soft cloth. The de...

Ahh! so thats what string theory is.

Thanks Richard
I will pass the message on
Debbie

Hi
Not sure if this is where i ask but my friend at another school can't log on anymore and has tried to change her password but that still won't work .Can someone help with this ??
Thanks
Debbie

Hi all for any one that uses chemwatch,they now have quite a lot of aldi brand products on their data base . This is handy as you can access the MSDS and the mini MSDS in chemwatch format. Most products can be found under ALDI but others go by different names so I would use the chemwatch numbers to ...

Hi
I think any principal that wants to put the office staff in the prep room should be reminded of their duty of care. Our work requires training, we are highly skilled people. At least we have some good networks around so we can acknowledge this even if some senior staff have no idea.
Debbie

Hi All I will bring my copy of the Physics Equipment for High Schools to the conference at St Marys next week for anyone to have a look at to see if it is what you want. I will make a few copies to hand out also. Someone kindly gave me my copy at the conference a few years ago so I'll be happy to re...

Hi all I work a 30 hour week and we have just over 1200 students (6 labs). Earlier this year I asked for help and now have someone in for 5 hours a week(one day) .To justify this my co-ordinator and myself put in a submission based not only on the total number of students but also the number of seni...

HI m I file our risk assessments in a ring binder, one binder for each year group. In that binder I put dividers for each chapter of the text book and one for miscellaneous since most of our pracs come straight out of the text.The teachers look through this folder to get a risk assessment and attach...

Hi all I do the stocktake for the whole school (1200 students) and it takes quite a while .This will be the last year that I do this.The reason being that if it is your department you need to know what stock you have and what you need to dispose of.It is hard to hand this job back to the people who ...