Answer all the questions, show all the work and the units where necessary to rec

Question

Answer all the questions, show all the work and the units where necessary to receive full credit. In the Redox Titration lab, you used the titrant solution of 0.02 M KMnO_4 to determine the percentage of Sodium Oxalate in an unknown solid sample. The net ionic equation for the titration is 2MnO_4^- + 5C_2O_4^2- + 16H^+ rightarrow 2Mn^2+ + 10CO_2 + 8H_2O If your initial burette reading was 39.75 mL, determine the volume of titrant you used for the titration Calculate the number of moles of KMnO_4 you used Calculate the number of moles of Na_2C_2O_4 reacted with KMnO_4

Explanation / Answer

Q1.

i)

Vi = 5.5 mL, Vf = 39.75 mL

dV = 39.75-5.5 = 34.25 mL used

ii)

find KMnO4

mol = MV =(0.02)(34.25 *10^-3) = 0.000685 mol of KMnO4

iii)

ratio is

2 mol of MNO4- per 5 mol of C2O5-2

so

0.000685 mol of MnO4- --> 5/2*0.000685 = 0.0017125 mol of C2O4-2

therefore

moles of Na2C2O4 = 0.0017125 moles

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