sion Chem Il cheggdocx Mailings Review View Help Tell me wha

sion Chem Il chegg.docx Mailings Review View Help Tell me what you want to do Question 5 (10 points) 2. A student prepared this solution by mixing the following solutions 4.00 mL of 0.00250 M Fe(NOsh 3.00 mL of 0.00250 M KSCN 3.00 mL of 0.050 M HNO From a plot of absorbance versus concentration of [Fe(SCN)], the equilibrium concentration of [Fe(SCN))), was determined to be 2.8 x 104 M Calculate the initial concentration of SCN before the system proceeds to equilibrium. Question 5 options 1.20 x 10-3 M 1.00 x10-3 432 x 10^-4 7.50 x 10A-4 700 x 10A-4 M Question 6 (10 points) 2. A student prepared this solution by mixing the following solutions 4.00 mL of 0.00250 M Fe(NOsh 3.00 mL of 0.00250 M KSCN 3.00 mL of 0.050 M HNO, From a plot of absorbance versus concentration of (Fe(SCN), the equilibrium concentration of [Fe(SCN)] was determined to be 2.8 x 10+ M Calculate the equilibrium constant. Question 6 options 6.25 x 10-4 2.8 x 10-4 827 r 6 44.8 0.022 NE

Solution

Initial concentration of SCN-=[SCN-]*Volume(SCN)/total solution volume

[[SCN-]=concentration of added SCN-,total solution volume=10ml=10ml(1L/1000ml)=0.010L

Volume(SCN)=3ml*(1L/1000ml)=0.003L

Initial concentration of SCN-=(0.00250M)*0.003L/(0.010L)=0.00075 M=7.5*10^-4M