Question

College Chemistry l- CHE 1550 Prelab 11: Beer's Law Spectroscopy of Cobalt lor 1. Calculate the number of grams of cobalt (ül) nitrate hexahydrate (Co(NO)2 6H 0) needed to make s0.0 ml of 0.150 M cobalt (Il) nitrate hexahydrate nceniolon:O.ISOM 2. Calculate the concentration of cobalt (Il) ions in each of the test tubes (1) through (5), prepared by diluting your 0.150 M stock solution as instructed in steps 3 and 4 of part A . Pyrex glass has an absorbance of 1.30 at wavelength of 280 nm, and an absorbance of 0.150 at 320 nm. (a) what is the percent transmission (%T) of Pyrex glass at those wavelengths? (b) would it be appropriate to use Pyrex test tubes or cuvettes when measuring the absorbance of a sample at wavelengths between 200 and 270 nm? Explain. A 2-log(%T) Can visible light cause the excitation of an electron in a pane of untinted clear window glass? Explain your answer.

#2,3,4 don't redo 1

Answer 1

Answ us 0 hexahy drale 6 atomic mones ic N 2. uclan mass f C(nos)a 920 Mcla't mass m. Now, looo mL cl 1 M selu hon ว«quer e 291 am solvent 0-1ço Montution.uequi狀 100p.mLof = 291 x0-1s。 113.45 วิท. solvent- 1600 50ml of o 1s0 M solutio require 43:13x50 = 2.2 8257m duo uwie c! to prepare 50 1soM)