Question

Name:. Date: Lab Section: 4. The blank solution used to calibrate the spectrophotometer is 5.0 mL of 0.2 M Fe(NO)) diluted to 50 mt with H:O Why is this solution preferred to simply using de-ionized water for the calibration? Te celibutoneans ser He astanat os errors-free Te deionized woser alane sho no abtorpton 5. A reaction mixture of 4.00 mL. of 0.00200 M SCN and 5.00 mL of 0.00200 M Fe is uoreangth diluted to 10.00 mL with 0.1 M HNO, to form the blood-red FeNCS2 complex. The equilibrium molar concentration of the FeNCS determined from a calibration curve, is 1.5 x 10- mol/L. Calculate, in sequence, each of the following quantities in the aqucous solution to determine the equilibrium constant for the reaction, Fe(ag) +SCN (aq) h FeNCS (aq) s. moles of FeNCS? that form in reaching equilibrium b. moles of Fe that react to form the FeNCS2 at equilibrium cmoles of SCN that react to form the FeNCS? at equilibrium d. moles of Fe initially placed in the reaction system e. moles of SCN-initially placed in the reaction system t moles of Fe* (unreacted) at equilibrium & moles of SCN (unreacted) at equilibrium h. molar concentration of Fe (unreacted) at equilibrium i molar concentration of SCN (unreacted) at equilibrium J. molar concentration of FeNCs at equilibrium 15x 10 mol/L

Answer 1