Iron(111)thiocyanate

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labperson
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Iron(111)thiocyanate

Post by labperson » 15 Nov 2018, 09:55

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

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Graham Kemp
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Re: Iron(111)thiocyanate

Post by Graham Kemp » 15 Nov 2018, 12:03

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.

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shellythenewlabby
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Re: Iron(111)thiocyanate

Post by shellythenewlabby » 20 Nov 2018, 06:16

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

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Anastasia
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Re: Iron(111)thiocyanate

Post by Anastasia » 20 Nov 2018, 08:08

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

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macca
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Re: Iron(111)thiocyanate

Post by macca » 20 Nov 2018, 11:49

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.

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Kathryn
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Re: Iron(111)thiocyanate

Post by Kathryn » 05 Nov 2019, 13:42

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

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fibreweb
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Re: Iron(111)thiocyanate

Post by fibreweb » 06 Nov 2019, 07:51

We just used the ones I mixed last year with great success

Merilyn1
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Re: Iron(111)thiocyanate

Post by Merilyn1 » 06 Nov 2019, 07:52

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
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Re: Iron(111)thiocyanate

Post by Marama T » 06 Nov 2019, 09:25

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
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Re: Iron(111)thiocyanate

Post by Happy Labby » 12 Nov 2019, 07:06

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
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Re: Iron(111)thiocyanate

Post by Marama T » 13 Nov 2019, 08:15

Hi Happy Labby,

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

Marama

Happy Labby
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Re: Iron(111)thiocyanate

Post by Happy Labby » 13 Nov 2019, 11:00

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

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