Question

In this experiment, the absorbance of the solutions will be determined at 447 nm. Why is this wavelength chosen? What experiments must have been done in order to select this wavelength?


Fe+3 +SCN- --->Fe(SCN)+2?

Answer 1

I think it has to do with the molar absorptivity constant and how it is unique to the resulting compound but I'm not sure..

Answer 2

@myininaya

Answer 3

What's the experiment? It sounds like you're probably on the right path, but why are we looking at 447? It might be that this is the peak wavelength of the compound we are trying to synthesize or identify?

Answer 4

we are mixing different volumes of the reactants to produce the product. 447nm is the wavelength of the light we are using to measure the absorbance of the product and how concentration affects the absorbance of this light.

Answer 5

the iron complex solution you're creating has a red color, so you want to measure it with a wavelength of light that you KNOW will be absorbed. 447nm is a blue light, which is a better choice than using 650nm, which is an orange-red light.

Answer 6

thanks so much!