Chemical Forums
1 Hour
1 Day
1 Week
1 Month
Forever
April 23, 2024, 05:53:57 AM
Forum Rules
: Read This Before Posting
Home
Help
Search
Login
Register
Chemical Forums
Chemistry Forums for Students
Analytical Chemistry Forum
UV spectrum
« previous
next »
Print
Pages: [
1
]
Go Down
Topic: UV spectrum (Read 2736 times)
0 Members and 1 Guest are viewing this topic.
mandytan
Regular Member
Posts: 29
Mole Snacks: +0/-0
UV spectrum
«
on:
December 06, 2011, 11:09:11 AM »
0.2g of a solid is dissolved in 1L solvent to give a concentration of 0.2g/L.
UV absorbance spectrum was collected.
The solid has 0.1%w/w water content.
What is the formula to calculate the absorptivity on the dried basis?
Logged
Arkcon
Retired Staff
Sr. Member
Posts: 7367
Mole Snacks: +533/-147
Re: UV spectrum
«
Reply #1 on:
December 06, 2011, 01:02:15 PM »
Well, start with the simplest part. If you mass out 0.2 g of something, and you know it is 0.1 % w/w water, how much did you really add?
Logged
Hey, I'm not judging. I just like to shoot straight. I'm a man of science.
mandytan
Regular Member
Posts: 29
Mole Snacks: +0/-0
Re: UV spectrum
«
Reply #2 on:
December 06, 2011, 04:15:24 PM »
So it means I actually added 0.1998g (dried substance).when we calculate absorptivity, do we use the concentration in g/L or mol/L?
Logged
Arkcon
Retired Staff
Sr. Member
Posts: 7367
Mole Snacks: +533/-147
Re: UV spectrum
«
Reply #3 on:
December 06, 2011, 04:28:48 PM »
Well, the only info we have so far is grams per liter. If you have the molar mass, you can convert, depending on what final answer you want.
Logged
Hey, I'm not judging. I just like to shoot straight. I'm a man of science.
Print
Pages: [
1
]
Go Up
« previous
next »
Sponsored Links
Chemical Forums
Chemistry Forums for Students
Analytical Chemistry Forum
UV spectrum