Iron(111)thiocyanate

Request or contribute your recipes here. You can also try doing a search, as there are some old recipe posts which have not or cannot be moved over to this forum.
Post Reply
User avatar
labperson
Posts: 18
Joined: 30 May 2012, 09:04
Job Title: Lab Assistant
School: Cabramatta High School
Suburb: Cabramatta
State/Location: NSW

Iron(111)thiocyanate

Post 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
User avatar
Graham Kemp
Posts: 172
Joined: 22 Nov 2011, 09:21
Job Title: Laboratory Assistant
School: St John's School
Suburb: Roma
State/Location: QLD

Re: Iron(111)thiocyanate

Post 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.
User avatar
shellythenewlabby
Posts: 50
Joined: 01 Jul 2016, 12:17
School: Woonona High School
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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
User avatar
Anastasia
Posts: 57
Joined: 29 May 2006, 10:00
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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
User avatar
macca
Posts: 850
Joined: 10 Dec 2008, 08:38
Job Title: Mind Reader
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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.
User avatar
Kathryn
Posts: 334
Joined: 01 Jun 2006, 10:00
Job Title: Lab Technician
School: Cedars Christian College
Suburb: Farmborough Hts, Wollongong
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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
User avatar
fibreweb
Posts: 620
Joined: 20 Jul 2006, 10:00
School: Oxley High School
Suburb: Tamworth
State/Location: NSW

Re: Iron(111)thiocyanate

Post by fibreweb »

We just used the ones I mixed last year with great success
Merilyn1
Posts: 1067
Joined: 12 Mar 2013, 08:10
Job Title: Labbie
School: Wollondilly Anglican College
Suburb: Tahmoor
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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.
Marama T
Posts: 85
Joined: 01 Aug 2017, 12:19
Job Title: Laboratory technician
School: Emmanuel Anglican College
Suburb: Ballina
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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
Happy Labby
Posts: 9
Joined: 28 Jul 2015, 20:06
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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
Marama T
Posts: 85
Joined: 01 Aug 2017, 12:19
Job Title: Laboratory technician
School: Emmanuel Anglican College
Suburb: Ballina
State/Location: NSW

Re: Iron(111)thiocyanate

Post by Marama T »

Hi Happy Labby,

No, sorry, I can't help you with that. We didn't use a spectrometer.

Marama
Happy Labby
Posts: 9
Joined: 28 Jul 2015, 20:06
State/Location: NSW

Re: Iron(111)thiocyanate

Post 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
User avatar
kimmy
Posts: 412
Joined: 01 Jun 2006, 10:00
Job Title: School Lab Assistant
School: Quirindi High School
Suburb: Quirindi
State/Location: NSW

iron (iii) thiocyanate ion solution

Post by kimmy »

can anyone tell me how to make this
iron (iii) thiocyanate ion solution

thank you in advance
User avatar
Labbie
Posts: 3011
Joined: 28 Nov 2006, 10:00
Job Title: Retired
Suburb: At Home
State/Location: NSW

Re: Iron(111)thiocyanate

Post by Labbie »

I have merged them for you Kimmy
Regards Labbie

Lab Manager/Lab Tech, mind reading etc etc
Now retired :wub:
Post Reply