distilled water
distilled water
Hi Ian
I make mine up fresh from my instant deioniser that is attached permanently to the tap (vertex) and I get ph 7 and it does 2 litres in a few minutes.Its great but a little pricey .
Its well worth buying it if you have the money
Rhonda
I make mine up fresh from my instant deioniser that is attached permanently to the tap (vertex) and I get ph 7 and it does 2 litres in a few minutes.Its great but a little pricey .
Its well worth buying it if you have the money
Rhonda
- nickykinz
- Posts: 271
- Joined: 02 Feb 2009, 12:53
- Job Title: Lab Assistant
- School: St Augustine's College
- Suburb: Augustine Heights
- State/Location: QLD
Re: distilled water
I am at a school where we have no still or deioniser. I will need to buy some water but which do I need to buy? Will deionised do everything or will I still need distilled for some things? I bought some demineralised from Bunnings yesterday just to see me through but I think that it was fairly expensive and is the same as deionised.
Nicky
Nicky
Nicky
St Augustine's College
Augustine Heights, QLD 4300
St Augustine's College
Augustine Heights, QLD 4300
- Robdean
- Posts: 147
- Joined: 01 Jun 2006, 10:00
- School: Lismore High School
- Suburb: Lismore
- State/Location: NSW
Re: distilled water
I'm also using demineralised water from Woolworths - just for making solutions such as silver nirate and for senior chem pracs calling for distilled water. Our chem teacher is more than happy with the results. Our last water still was past its use by date and unfixable so for us this is a cost effective solution. I hated seeing all that water pour down the sink when using our dreadfully slow still!
Re: distilled water
We have a very old still, which wastes a lot of water! First thing I did when I started here was to purchase a proper still. We still have the old one laying about. I shall ask my HOD and perhaps she will agree to donate it to your school... Leav it with me!
Sassi
Sassi
Re: distilled water
I've been getting our demineralised water from Big W 4Lt for around $3. They are generally pretty well stocked areound here.
Re: distilled water
I'm sure I said this somewhere last year, but check out your local car battery suppliers. I but demineralised water for 50c per litre, which is the cheapest in town, from our local battery bloke. Way more economical than Bunnings or Big W.
Cheers, K
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- School: Central Coast Grammar School
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- State/Location: NSW
Re: distilled water
Im very glad this subject has come up cos Im just about to order 40 L of distilled water at a cost of ninety dollars because our distilled water (previously bought) has a pH of 5.5. The chem teacher doesnt want me to use it to make up senior chemicals, is it really a problem???? Also I bought pH buffer tablets to make up some buffers to calibrate our pH probe with, will using distilled water with a pH of 5.5 affect the accuracy of the buffer or will the buffer "buffer" itself!!! Thanks heaps for any imput, I love this site Maria
Re: distilled water
I now get my Distilled water from 'Water to Go' delivered to my prep room for $20 for 4L... works well for me..
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- Suburb: Tamworth
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Re: distilled water
You can get 4L for less than $4 at Big W. $20 is a lot, even delivered! Is Booragul big enough for a Big W? You'd save your science department a lot of money! During the drought I got mine from Blackwoods $20 for 20L but now the dam is full (yay!!) I am back to using the still. Although at the rate the 'waste' water comes out compared to the amount of distilled water we get, the dam may not be full much longer!
- Labbie
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Re: distilled water
Please remember the forum rules, do not name companies.
Thanks
Thanks
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Re: distilled water
Hi everyone,
We used to have a still but have changed over to a deioniser.
The distilled water would sometimes have a PH of 6 but the deionised water I have just used has a PH of nearly 8. Is this normal? The teachers are a little confused by the readings.
Helen
We used to have a still but have changed over to a deioniser.
The distilled water would sometimes have a PH of 6 but the deionised water I have just used has a PH of nearly 8. Is this normal? The teachers are a little confused by the readings.
Helen
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Re: distilled water
Hi, I also have a question on distilled water.
Is there an expiry date on distilled water? I make it through a still and I am now thinking I should put date on the spray bottles I make up. Is this correct? Does it deteriorate over time like the chemical solutions?
Rosemary
Is there an expiry date on distilled water? I make it through a still and I am now thinking I should put date on the spray bottles I make up. Is this correct? Does it deteriorate over time like the chemical solutions?
Rosemary
- Labbie
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Re: distilled water
good question, should take bets on the answer.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
- Ian
- Posts: 575
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- School: Macarthur Anglican School
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- State/Location: NSW
Re: distilled water
Surely it would depend on how sterile is the container. Biological contamination would be the only problem. The water itself should last several millennia!rosiegbh wrote:Hi, I also have a question on distilled water.
Is there an expiry date on distilled water? I make it through a still and I am now thinking I should put date on the spray bottles I make up. Is this correct? Does it deteriorate over time like the chemical solutions?
Rosemary
Ian
Re: Distilled Water
MariaC wrote: Im very glad this subject has come up cos Im just about to order 40 L of distilled water at a cost of ninety dollars because our distilled water (previously bought) has a pH of 5.5. The chem teacher doesnt want me to use it to make up senior chemicals, is it really a problem???? Also I bought pH buffer tablets to make up some buffers to calibrate our pH probe with, will using distilled water with a pH of 5.5 affect the accuracy of the buffer or will the buffer "buffer" itself!!! Thanks heaps for any imput, I love this site Maria
Hi MariaC,
In the case here, We need to take into consideration pure chemistry here, pH will fluctuate according to town water sources and the amount of CO2 absorbance from the atmosphere, regardless its going to happen, in some cases CO2 absorbance will balance out pH but most cases this does not happen.
Deionised water acts as a CO2grabber, it see's it in the air and pulls it in, like a hungry crocodile...
I have measured Modulab water which is "Pure Water" in my research days and the change in pH is within minutes. Modulab is H2O nothing else, measuring its resistance and conductivity at the same time is the only indication of its pure water state. Never open a bottle for longer than necesarry with this type of water.
In schools you will never come into contact with it, its just too expensive for the instrumentation and also cost to buy.
As far as buffers go for buffering or calibrating pH probes, only use the tablets if you have a pH probe that can be calibrated either by software or the desk top calibration and Onscreen disply. The tablet will not affect the normal workings of the probe even when the water is at pH 5 - 5.5, naturally enough the water will not be an issue for titrations. Also good argument to use is that pH is also very temperature dependant. This could also be a major contributor.
I hope this brings a good conclusion to your questions..
Cheers,
Robb.....
Dr Robert Crosdale. MRACI. NSS. NSSA. NASA.
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Ph.D (Chem), Post Grad Ph.D (Physics), M.Ed, B.Sc (Hons), Dip. Appl. Sc. (Chem)
Lake Munmorah High School.
University of New England.
University of New South Wales.
University of Newcastle.
To understand the Universe from our perspective, we need to look towards our own backyard first for answers.
** AD ASTRA PER ASPERA - SEMPER EXPLORO **
Re: distilled water
I have a problem with teachers coming to me and complaining that our distilled water has pH of 3.5, what they don't realise is distilled water has no ions therefore it will not change the memory of the last reading, If the last reading was 7 buffer wash and take reading it will be 7, Also how clean was the test tube / Beaker they used, I can't argue with them ,they are brilliant teachers I'm just a dumb glassware washer!
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- Posts: 174
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- School: Central Coast Grammar School
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- State/Location: NSW
Re: distilled water
Thanks Robb for your reply, thats why I love this site, glad now that I haven't had the time to order the water and will just buy it as needed from the local supermarket Small fresh stocks should work fine for me.
cheers again MariaC
cheers again MariaC
- vlclabbie
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Re: distilled water
Hi Rhonda, it's now a year on from this discussion....... but I was wondering if you could PM me the name of the product this is & the company that I can get it from? I f you can remember .... it's a while ago!I make mine up fresh from my instant deioniser that is attached permanently to the tap (vertex) and I get ph 7 and it does 2 litres in a few minutes.Its great but a little pricey .
Its well worth buying it if you have the money
Rhonda
Thanks!
Cheers Kel
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- Suburb: Townsville
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Re: distilled water
Where do you all buy your DI water from?
We have a Millipore deioniser which we need a new cartridge for. We ordered it 8 weeks ago and still not coming despite checking, ringing etc.
Having to resort to buying water.
We have a Millipore deioniser which we need a new cartridge for. We ordered it 8 weeks ago and still not coming despite checking, ringing etc.
Having to resort to buying water.
- Ian
- Posts: 575
- Joined: 16 Oct 2006, 10:00
- Job Title: Lab Assistant
- School: Macarthur Anglican School
- Suburb: Cobbitty
- State/Location: NSW
Re: distilled water
I get mine from Coles in 2L bottles. Well, it is "De-ionised", actually, but it seems to work as well as Distilled! (zero conductivity, no chlorides, pH about the same as distilled, etc) and about $1.30 per 2 litres. (which is less per year than I was paying for cartridges for my Vertex filter system
cheers
Ian
cheers
Ian