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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: janaelkat on October 21, 2020, 12:42:44 PM

Title: Lab help
Post by: janaelkat on October 21, 2020, 12:42:44 PM

Could anyone help me figure out these numbers? My lab professor is insanely unhelpful. He assigned us 9 pages and refuses to answer his email. I have 8 more pages to do but I can’t start them until I have these numbers figured out. >_<

Title: Re: Lab help
Post by: chenbeier on October 21, 2020, 04:21:57 PM

What do you dont  understand ?
The first number is the wave length where the max. absorption of light of permanganate takes place.
Then the absortivity factor is given.

Then a make up procedure of a special ipa solution contains fluoride is given.

The last are some measured results.

I guess permanganate should react with the alcohol and the disappearing of color is detected.

Title: Re: Lab help
Post by: Babcock_Hall on October 22, 2020, 11:40:37 AM

Can you show how you calculated one of the averages?