please answer the following : An acidic solution of Na_2 C_2 O_4 may be used to
ID: 998617 • Letter: P
Question
please answer the following :
An acidic solution of Na_2 C_2 O_4 may be used to standardize the concentration of KMnO_4 solution. The balanced redox equation between the 2 is: 2 MnO_4(aq)^- + 5 C_2 O_4(aq)^-2 + 16 H_(aq)^+ rightarrow 2 Mn^+2_(aq) + 10 CO_2(g) + 8 H_2 O_(l). In A certain experiment 0.2050 g of Na_2 C_2 O_4 was titrated against 22.00 ml of KMnO_4 solution. Find the Molarity of the KMnO_4 solution. The molecular wt. of Na_2 C_2 O_4 = 134.0. Find the volume of CO_2(g) produced in the above titration if the CO_2(g) was collected, dried and placed into a vessel at 25 degree C and the pressure was 740 torr.Explanation / Answer
5 mol of oxalate reacts with 2 mol of KMnO4
mol of oxalate= 0.2050/134=0.00153 mol
0.00153 mol of oxalate reacts with 2/5*0.00153 = 6.12mmol of KMnO4;
22 mL of X M KMnO4 should be equal to 6.12mmol ; thus 22*X=6.12 mmol; X= 0.2782 M is the strength of KMnO4 Solution.
b) number of mole of CO2 formed= 2*number of mol of oxalate oxidised = 2*0.00153 mol=0.00306 mol
By PV=nRT; V= 0.00306*0.0821*298*760/740 = 0.07688L = 76.88mL.
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