please help.Copper Analysis by Spectroscopy?

You are given a solid UNKNOWN, containing copper, weighing 1.6595 g. You dissolve this in concentrated Nitric Acid, HNO3, transfer quantitatively to a 100 mL volumetric flask, add the required amount of Ammonia, NH3, dilute to volume and mix thoroughly.This resulting solution is too concentrated and the resulting %T measured in the same cuvet and spectrometer as before gave little or no transmission (lt;10%).You are told to pipet 12.00 mL into a 100 mL volumetric flask, add the required amount of ammonia, dilute to volume and mix.Spectroscopic measurement of this solution gave %T. 38.5 %CALCULATE:The Percent of copper in the original solid UNKNOWN._________%Cu

Answer:

Copper Analysis By Spectroscopy

Thanks a ton! This was INSANELY helpful!!!

Part of Kluiber's prelab I presume. l)absorbance of diluted solution Alog(blank/sample) Alog(blank/38.5) (fill blank in with your blank %) we'll call the A value here AD (absrobance diluted) for the following problems. m) copper concentration of diluted solution in.M M AD/average ratio of absorbance you'll find the average ratio of absorbance is g) on the sheet we'll call the M value here CD(concentration diluted) for the following problems. n)copper concentration in original solution.M MCD[100mL/1000]/[12.00mL/1000]-conver. to liters MCD(.1L)/.012L we'll call the M value here CO (concentration original) for the following problems. o)% copper in original solution .%Cu %Cu ([CO(atomic weight of copper)]/weight of solid unknown)*100 %Cu ([CO(63.546)]/1.6595)*100 Hope this helps. (this is a duplicate post)

Thanks a ton! This was INSANELY helpful!!!