Yr 12. Determination of Keq by Colorimetry
Yr 12. Determination of Keq by Colorimetry
Hi Brains trust,
Person Chemistry 12 prac.5.4
Is anyone having a win doing this practical? This is the second year we are having no luck with results.
Thanks in advance
Person Chemistry 12 prac.5.4
Is anyone having a win doing this practical? This is the second year we are having no luck with results.
Thanks in advance
- kimmy
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Re: Yr 12. Determination of Keq by Colorimetry
iv just been given this prac to get ready and trying to work out the chemicals at the moment.
Re: Yr 12. Determination of Keq by Colorimetry
Hi Kimmy
Yep a real nightmare. This year, different teacher has tried a variation and is getting some results although not the higher readings that were sort.
Using 0.1M HNO3
0.5M KSCN
0.0001M Fe(NO3)3
0.0025M KSCN
0.0025M Fe(NO3)3
Yep a real nightmare. This year, different teacher has tried a variation and is getting some results although not the higher readings that were sort.
Using 0.1M HNO3
0.5M KSCN
0.0001M Fe(NO3)3
0.0025M KSCN
0.0025M Fe(NO3)3
- kimmy
- Posts: 418
- Joined: 01 Jun 2006, 10:00
- Job Title: School Lab Assistant
- School: Quirindi High School
- Suburb: Quirindi
- State/Location: NSW
Re: Yr 12. Determination of Keq by Colorimetry
Thank you, ill let you know how we get on next week.
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Re: Yr 12. Determination of Keq by Colorimetry
We just did it .Chem teacher used an old book they used to do it 20 years ago .
0.2M Fe(NO)3
0.002M KSCN
He said it worked a teat . I wonder if your books have typos in them and the Molarities are back to front
0.2M Fe(NO)3
0.002M KSCN
He said it worked a teat . I wonder if your books have typos in them and the Molarities are back to front
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Re: Yr 12. Determination of Keq by Colorimetry
My Chem teacher uses 5ml each of 0.2M Ferric Nitrate and 0.2M of KSCN. Seems happy with that.
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Re: Yr 12. Determination of Keq by Colorimetry
Hey bigmac,
Which textbook is your chem teacher using, as we too are getting some weird results? Could you please find out for me.
Thnks
Carlie
Which textbook is your chem teacher using, as we too are getting some weird results? Could you please find out for me.
Thnks
Carlie
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Re: Yr 12. Determination of Keq by Colorimetry
Hi Carliectzavellas wrote: ↑04 Nov 2019, 11:33 Hey bigmac,
Which textbook is your chem teacher using, as we too are getting some weird results? Could you please find out for me.
Thnks
Carlie
It's an old text book called Chemical Science ,Laboratory Manual ,Carswell.
We have both the student version and the teachers version which has answers in it .
out of interest I was telling my Chem teacher that some were having issues with it . He pointed to the answers obtained in the teachers version of the book and suggested that perhaps the teachers were expecting exact number constant on each test whereas in reality there is a spread of answers that are around the constant value expected .
Here's a cropped screen shot of the pdf copy of the teachers version of the book .
You do not have the required permissions to view the files attached to this post.
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Re: Yr 12. Determination of Keq by Colorimetry
Hey Macca,
Did you guys use both the method of matching the color by eye and colorimeter for this prac?
Carlie
Did you guys use both the method of matching the color by eye and colorimeter for this prac?
Carlie
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Re: Yr 12. Determination of Keq by Colorimetry
ctzavellas wrote: ↑04 Nov 2019, 14:22 Hey Macca,
Did you guys use both the method of matching the color by eye and colorimeter for this prac?
Carlie
Re: Yr 12. Determination of Keq by Colorimetry
Yes we did, they are going to give that old method above ago next year. Think just ended up speculating on what the results should have bwen.