Question

PRE-LAB EXERCISE 

For the solutions that you will prepare in Step 1 of Part 1 (using Table 2 data), calculate the [FeSCN2+]. Presume that all of the SCN-ions react. In Part I of the experiment, mol of SCN = mol of FeSCN2+. You will need the calculated (FeSCN2+] in Step 6. Record these values in the grey rows in Table 1 and Table 1.1 in the Data and Calculations section 

Table 1 Concentration of [FeSCN2+) in the Test Standard Solutions 

Note: * Use this code to locate where to write the calculated (FeSCN2+] in Data and Calculations Section on Page 12. Also show your calculations in the Data and Calculations Section. 

PROCEDURE 

Part 1 Prepare and Test Standard Solutions 

4 mixtures of standard solutions was prepared according to this table : 

Answer 1

Limiting reagent here is SCN-

Fe(NO3)3 + SCN- ---> [Fe(SCN)]2+    Answer

(0.2 mol L-1)(0.0005 L) (0.002 mol L-1)(0.0004 L)    0.0000008 mol

0.0001 mol 0.0000008 mol   (0.0000008 mol) / (0.005 L) = .004 M (C1)

(0.2 mol L-1)(0.0005 L) (0.002 mol L-1)(0.0003 L)

0.0001 mol 0.0000006 mol (0.0000006 mol) / (0.005 L) = .003 M (C2)

(0.2 mol L-1)(0.0005 L) (0.002 mol L-1)(0.0002 L)

0.0001 mol 0.0000004 mol    (0.0000004 mol) / (0.005 L) = .002 M (C3)

(0.2 mol L-1)(0.0005 L) (0.002 mol L-1)(0.0001 L)

0.0001 mol 0.0000002 mol   (0.0000002 mol) / (0.005 L) = .001 M (C4)