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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: boodyx1 on January 25, 2010, 05:36:29 PM

Title: question about uv spectroscopy
Post by: boodyx1 on January 25, 2010, 05:36:29 PM

1-uv spectrum of iodine solution (.0014 M) shows band at 458 nm and (T =35%) using 0.1 cm cell  calculate absorbance of .035 M ?
2- show dependence of of absorbed  light frequency on type of sample?
3- show why max. wavelength does not change when concentration change?
i understand answer of these Que. but i need the ideal answer for them

Title: Re: question about uv spectroscopy
Post by: bromidewind on January 26, 2010, 04:51:56 AM

Give us your answers first, and we'll give you souped up answers back.

We're kind of like the Pimp My Ride of chemistry homework.. we take in what you used to think was good, tear it down, rebuild it, repaint it, then surprise you with it a day or two later.

Title: Re: question about uv spectroscopy
Post by: Golden_4_Life on January 26, 2010, 10:55:23 AM

Step # 1: compute the Molar Absorptivity (extinction coefficient) for your Iodine prep.

looking fwd to your posts.

Title: Re: question about uv spectroscopy
Post by: xoto on February 16, 2010, 04:44:19 PM

using  a relationship between absorbance and percent T,calculate the molar absorptivity. using this value and the new concentration,path lenght, get your absorbance.
but then, show us your answer before we give you the 'ideal'