Best M.W. information
- kimmy
- Posts: 418
- Joined: 01 Jun 2006, 10:00
- Job Title: School Lab Assistant
- School: Quirindi High School
- Suburb: Quirindi
- State/Location: NSW
Best M.W. information
OK i am doing up a new information booklet for the common chemicals i use at school. This is just for myself for making up solutions of my common chemcials.
So many sites have different information on them for the strength of chemicals.
What is the best site to get accurate information.
Even between the Working in Science book distributed to us from DET is different to the book "The Laboratory".
any suggestions will be appreciated.
So many sites have different information on them for the strength of chemicals.
What is the best site to get accurate information.
Even between the Working in Science book distributed to us from DET is different to the book "The Laboratory".
any suggestions will be appreciated.
Re: Best M.W. information
If in doubt, make your own calculations using the molecular weight of the chemical.
I have to rush off to a meeting now but I'm sure someone else can explain. Once you do this, you'll wonder why you ever had to look it up!
I have to rush off to a meeting now but I'm sure someone else can explain. Once you do this, you'll wonder why you ever had to look it up!
- kimmy
- Posts: 418
- Joined: 01 Jun 2006, 10:00
- Job Title: School Lab Assistant
- School: Quirindi High School
- Suburb: Quirindi
- State/Location: NSW
Re: Best M.W. information
Yes i know how to do this but even these are different on different sites. I just thought someone might know a site where it was the correct M.W.
eg Ammonium Oxalate
MW on Pub Chem is like 124.1
but on another site it is
142.11
-
- Posts: 1496
- Joined: 12 Mar 2013, 08:10
- Job Title: Labbie
- School: Wollondilly Anglican College
- Suburb: Tahmoor
- State/Location: NSW
Re: Best M.W. information
For molecular weight, check the individual container which will have it somewhere on the label, or, you can work it out from the formula, which will also be on the label. That would be the most reliable source.
-
- Posts: 829
- Joined: 15 Dec 2015, 10:49
- Job Title: Lab Technician
- School: FCAC
- State/Location: QLD
Re: Best M.W. information
Anhydrous versions have different MW.
That is why it is best to use the MW on the bottle .That way you know it matches what you have .Some recipe books don't state which type .
That is why it is best to use the MW on the bottle .That way you know it matches what you have .Some recipe books don't state which type .
You do not have the required permissions to view the files attached to this post.
- shellythenewlabby
- Posts: 53
- Joined: 01 Jul 2016, 12:17
- School: Woonona High School
- State/Location: NSW
Re: Best M.W. information
Hi Kimmy
I usually use this website if i get stuck and have found it good. Hope it helps
https://www.sigmaaldrich.com/chemistry/ ... lator.html
I usually use this website if i get stuck and have found it good. Hope it helps
https://www.sigmaaldrich.com/chemistry/ ... lator.html
- kimmy
- Posts: 418
- Joined: 01 Jun 2006, 10:00
- Job Title: School Lab Assistant
- School: Quirindi High School
- Suburb: Quirindi
- State/Location: NSW
Re: Best M.W. information
thank youshellythenewlabby wrote: ↑20 Aug 2020, 11:45 Hi Kimmy
I usually use this website if i get stuck and have found it good. Hope it helps
https://www.sigmaaldrich.com/chemistry/ ... lator.html
- kimmy
- Posts: 418
- Joined: 01 Jun 2006, 10:00
- Job Title: School Lab Assistant
- School: Quirindi High School
- Suburb: Quirindi
- State/Location: NSW
Re: Best M.W. information
yes i think i will just go off my actual jars, thought there might have been a easier way.
Funny how it is hard to make our lives easy.
- Labbie
- Posts: 3243
- Joined: 28 Nov 2006, 10:00
- Job Title: Retired
- Suburb: At Home
- State/Location: NSW
Re: Best M.W. information
Great information above, well done folks, hats off to you all.
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
-
- Posts: 513
- Joined: 15 Aug 2011, 10:48
- Job Title: Lab Tech
- School: NDSC
- Suburb: west gippsland
- State/Location: VIC
Re: Best M.W. information
I usually go off the container label, but I did download "Preparation of Solutions The Easy Reference" by S Rowley off chemtalk a while back. I use it to train new labbies or teachers. I also use The Laboratory but it has quite a few errors in it, if you can source "A Handbook of Laboratory Solutions. M.H.Gabb and W.E.Latchem", it is an excellent reference especially for stains and indicators.