Q1. Three parameters affect the absorbance of a sample. Which one is the focus of this experiment? the molar absorptivity coefficient concentration of the absorbing substance thickness of the sample containing the absorbing substance Q3. In experimental Procedure, Part A.1: For preparing a set of standard solutions of FeNCS 27, the equilibrium molar concentration of FeNCS2+ is assumed to equal the initial molar concentration of the SCN in the reaction mixture. Why is this assumption valid? The high concentration of the SCN ion ensures that the reaction is favored to the right The low concentration of the iron ion ensures that the reaction is favored to go to the right This reaction will not reach equilibrium The high concentration of the iron ion ensures that the reaction is favored to go to the right