Use a spreadsheet to do the calculations and plot the titration curves for the following titrations. Calculate potentials after the addition of titrant corresponding to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, 99%, 99.9%, 100%, 101%, 105%, 110%, and 120% of the equivalence-point volume.

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(a) 20.00 mL of 0.0500 M SnCl₂ with 0.100 M FeCl3. (b) 25.00 mL of 0.08467 M Na2S₂O3 with 0.10235 MI₂. (c) 0.1250 g of primary-standard-grade Na₂C₂O4 with 0.01035 M KMnO4. Assume [H*] = 1.00 M and pco, = 1 atm. (d) 20.00 mL of 0.1034 M Fe²+ with 0.01500 M K₂Cr₂O7. Assume [H+] = 1.00 M.