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Iron(111)thiocyanate
Posted: 15 Nov 2018, 09:55
by labperson
Help
I need help to make the following chemicals. I cannot locate any recipes in any of my books
1) Fe(NO3) .....0.0020m
2)KSCN .........0.0020m
3)Fe(SCN)3 .......0.0002m
thanking you all in advance
Re: Iron(111)thiocyanate
Posted: 15 Nov 2018, 12:03
by Graham Kemp
Ferric nitrate may be available in nonahydrate or anydrous form. Check on the lable.
* Fe(NO3)3.9H2O is 403.999 g/mol so 0.0020M will be 0.0808 g/100mL
* Fe(NO3)3 is 241.86 g/mol so 0.0020M will be 0.0484 g/100mL
Potassium Thiocyanate
* KSCN is 97.181 g/mol so 0.0020M will be 0.0194 g/100mL
Ferric Thiocyanate complex forms in the colourimetric determination reaction. You don't make your own.
* Fe(NO3)3 + 3 KSCN = Fe(SCN)3 + 3 KNO3
Suggestion: For the calibration plot, 0.10 mL increments of 0.00100 M KSCN are added to 4.00 mL of 0.200 M Fe(NO3)3, and for the equilibrium solutions, 0.50 mL increments of 0.00200 M KSCN are added to 4.00 mL of 0.00200 M Fe(NO3)3.
Re: Iron(111)thiocyanate
Posted: 20 Nov 2018, 06:16
by shellythenewlabby
Hi
I use a website called Mass Molarity Calculator Sigma-Aldrich for when I have hard solutions to make.
https://www.sigmaaldrich.com/chemistry/ ... lator.html
I just click on one of the links to work things out.
Hope this helps
Re: Iron(111)thiocyanate
Posted: 20 Nov 2018, 08:08
by Anastasia
From the recipe section of Pearson Chem 12 to prepare 0.0002M iron(III) thiocyanate
pipette 10ml 0.002M KSCN into a 100ml volumetric flask
make up to 100ml with 0.002M Fe(NO3)3
make fresh as solution degrades
Re: Iron(111)thiocyanate
Posted: 20 Nov 2018, 11:49
by macca
This new year 12 Chemistry pracs are doing my head in, great to have a challenge, from chemicals kids aren't to use and shouldn't be using, to mind reading some of it.
NOW asking for 5 x 10-4molL-1 iron (III) thiocyanate = 0.0005m is that right? hate looking like an idiot! Practical investigation of an equilibrium system
Did every ones students have success with Determination of Keq by colorimetry
only a little rant.
Re: Iron(111)thiocyanate
Posted: 05 Nov 2019, 13:42
by Kathryn
Just finished this prac for this year. I know the iron thiocyanate has to be made fresh, but can the 0.002M KSCN and the 0.002M Fe(NO3)3 be kept until next year? ie: what is the shelf life for these solutions?
Thanks
Kathryn
Re: Iron(111)thiocyanate
Posted: 06 Nov 2019, 07:51
by fibreweb
We just used the ones I mixed last year with great success
Re: Iron(111)thiocyanate
Posted: 06 Nov 2019, 07:52
by Merilyn1
My chem teacher got me to keep the solution from last year which he was happy to use this year. As far as I know, it all worked fine.
Re: Iron(111)thiocyanate
Posted: 06 Nov 2019, 09:25
by Marama T
Hi Kathryn,
Official shelf life doesn't always indicate loss of reactivity. I'm still using the same solutions three or four years later with good results.
Marama
Re: Iron(111)thiocyanate
Posted: 12 Nov 2019, 07:06
by Happy Labby
Hi Marama,
I prepared these solutions just yesterday just wondering did your chem teacher use a spectrometer to get the absorbance of the solutions and if yes,what type of results did you get?I think our Keq is a little out
Thanks Happy labby
Re: Iron(111)thiocyanate
Posted: 13 Nov 2019, 08:15
by Marama T
Hi Happy Labby,
No, sorry, I can't help you with that. We didn't use a spectrometer.
Marama
Re: Iron(111)thiocyanate
Posted: 13 Nov 2019, 11:00
by Happy Labby
Hi Everyone,
Did anyone use a spectrometer to get the absorbance of the solutions? and if yes could they share the results with me
Many thanks
Happy Labby
iron (iii) thiocyanate ion solution
Posted: 26 Feb 2021, 13:04
by kimmy
can anyone tell me how to make this
iron (iii) thiocyanate ion solution
thank you in advance
Re: Iron(111)thiocyanate
Posted: 26 Feb 2021, 13:50
by Labbie
I have merged them for you Kimmy
iron (lll) thiocyanate
Posted: 17 Sep 2021, 11:00
by judy2018
Hi All
Need help PLEASE
making iron (lll) thiocyanate
I have no idea
THANK YOU
Judy
Re: iron (lll) thiocyanate
Posted: 17 Sep 2021, 11:40
by J
Hi Judy.
Search iron thiocyanate in the search box above and you'll see previous discussions on this.
J
Re: iron (lll) thiocyanate
Posted: 17 Sep 2021, 12:24
by Labbie
Hope this helps Judy2018