analytical chemistry question

4. Calculate the potential of the solution (vs. S.C.E.) in the titration of 50.0 mL of 0.100 M Fe2+ in 1.00M HClO4 with 0.0167 M Cr2O72- at

(a) (4 marks) 10.0 mL titrant added

(b) (2 marks) 25.0 mL titrant added

(c) (4 marks) 49.9 ml titrant added (hint: may need to use an approximation)

(d) (3 marks) 60.0 mL titrant added.

(e) (7 marks) Plot the titration curve using Excel or other spreadsheet software.

(f) (2 marks) What would be a suitable redox indicator for this titration and why?

 

5. Calculate the potential of the solution (vs. S.C.E.) in the titration of 50.0 mL of 0.100 M Fe2+ in 1.00M

HClO4 with 0.100 M Cr2O7

2- at

(a) (2 marks) 3.0 mL titrant added

(b) (2 marks) 7.0 mL titrant added

(c) (2 marks) 8.40 ml titrant added

(d) (5 marks) Plot the titration curve using Excel or other spreadsheet software. How does the

curve compare to the curve obtained in Question 4?

(e) (2 marks) What parameter would you change in redox titration to make the equivalence point easier to detect? Answer the question both in (i) general terms and with specific suggestions for this particular titration.