Lab Data LABORATORY SIMULATION Initial concentration (SCN) (M) Absorbance Equilibrium (FeSCN2] (M) 0.00100 0.269 0.000212 0.000800 0.000600 0.000400 0.000200 0.192 0.104 0.052 0.000152 0.000122 0.0000821 0.000041 Equilibrium constant K Average Kc How to calculate iron()thiocyanate complex ion concentration for stock solution How to calculate initial.concentrations of iron() ion and thiocyanate in How to determine iron().thiocyanate.comelex.ion.concentration using absorbance How to calculate equilibrium concentrations of iron().ion and thiodvagate.ion How to calculate the equilibrium.constant Using Spectrophotometry Vi How to calculate equilibrium concentrations of iron(II) ion and thiocyanate ion Initial concentration() Initial concentration (SCN)(M) Equilibrium iren) thiocyanate complex ion FeSCN(M) 000050 0.000130 1. Examine the equilibrium reaction for the formation of the irce010 thiocyanate complexion Fe" (ag) +SCN (a) FSCN (a) 2. Write out an equilibrium table Fe() SCN() FSC Initial (M) 0.00050 0.00330 Change (M) -x Equilibrium (M) 0.00050-x 0.00030-x 0+% Fe() SCN() Initial (M) 0.00050 0.00030 Change (M) Equilibrium (M) 0.00050-x 0.00030-x 3. Remember, the equilibrium concentration of the iron(18) thiocyanate complex ion was determined using its absorbance. Therefore, the 'x' in the equilibrium table equals 0.000130 M Equilibrium concentration of non Fe 0.00050 M-0.000130 M 0.00037 M Equilibrium concentration of thiocyanate ion SCN 0.00030 M-0.000130 M-0.00017 M Equilibrium concentration of inan(80) thiocyanate ion PeSCN 0.000130 M How to calculate the equilibrium constant Data Equilibrium concentration of iron(II) ion 0.00037 [Fe(M) Equilibrium concentration of thiocyanate lon 0.00017 [SCN] (M) Equilibrium concentration of the iron() thiocyanate complexion [FSCN (M) 0.000130 1. Use the equilibrium reaction for the formation of the iron(II) thiocyanate complex ion, FeSCN, to write the equilibrium expression, K Fe (aq) + SCN (aq) FeSCN (aq) K- FeSCN Fe+||SCN] 0.000130 (0.00037)(0.00017) 2066.77-2100 ©2024 McGraw H LLC. All Rights Reserved. Terms of Us Lab Data Concentration iron() nitrate [Fe(NO) (M) Color of iron(II) nitrate Concentration potassium thiocyanate IKSEN (M Color of potassium thiocyanate Volume iron(III) nitrate (mL) Volume potassium thiocyanate (mL) Volume DI water (mL) Concentration iron(III) thiocyanate ion in stock solution [FeSCN(M) Color of stock solution 0.20000 0.00200 colorless 10.00 2.00 8.00 0.000200 red-orange - X Lab Data Color of stock solution red-orange Diluted solutions Solution 1 Solution 2 Solution 3 Waste Volume steck solution (mL) 4.00 4.00 Volume DI water (mL) 200 3.00 Concentration iron()thiocyanate lon 0.000160 0.000133 0.000114 FSCN (M) Calibration curve Solution Concentration iron(II) thiocyanate in [FSCN (M) Absorbance Stock Solution 1 0.000200 0.000160 0.272 0217 Lab Data Volume DI water (mL) Concentration iron(II) thiocyanate ion IFSCN 2.00 3.00 0.000160 0.000133 0.000114 (M) Calibration curve Solution Concentration iron(i) thiocyanate lon [FeSCN(M) Stock Solution 1 Solution 2 Solution 3 0.000200 0.000160 0.000133 0.000114 Molar absorptivity (Mem) 1359 A all EQUILIBRIUM EQUILIBRIUM GUNSTANT (SPECTRUPHUTUMETRY) INTRODUCTION LABORATORY SIMULATION Lab Data Prepared solutions, absorbance, and calculated [FeSCN2*] Absorbance 0.272 0.217 0.181 0.155 - X - X Solution 1 Solution 2 Solution 3 Solution 4 Solution 5 Concentration iron(II) nitrate [Fe(NO)(M) 0.00200 0.00200 0.00200 0.00200 0.00200 Wast Concentration potassium thiocyanate 0.00200 0.00200 0.00200 0.00200 DKSENIA Volume Fe(NO)s (mL) 5.00 5.00 5.00 5.00 5.00 Volume KSCN (m) 5.00 4.00 3.00 2.00 1.00 Volume DI water (mL) 0.00 2.00 3.00 4.00 Initial concentration [F] (M) Initial concentration [SCN] (M) Absorbance 0.00100 0.00100 0.00100 0.269 0.00100 0.00100 0.00100 0.192 Equilibrium [FeSCN2] (M) 0.000212 0.000152 0000800 0.000600 0.000400 0.154 0.104 0.000122 0.0000821 0.000200 0.052 0.000041 ©2024 McGraw Hil