(a) How many grams of H202 are contained in a solution that requires for titration 14.05 mL of KMNO4 of which 1.000 mL 0.008378 g Fe (i.e. will oxidize that amount of iron from the divalent to the trivalent state)? (b) How many grams and how many milliliters of oxygen measured dry and under standard conditions are evolved during the titration?

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Exercise III- 2
1. (a) How many grams of H2O2 are contained in a solution that reguires for titration 14.05 mL
of KMNO4 of which 1.000 mL 0.008378 g Fe (i.e. will oxidize that amount of iron from the
divalent to the trivalent state)? (b) How many grams and how many milliliters of oxygen measured
dry and under standard conditions are evolved during the titration?
2. What volume of 0.0300 M KMNO4 is required to react in acid solution with 5.00 mL of H2O2 that has a
density of 1.01 g/mL and contains 3.00% by weight H,O2? The permanganate is reduced to Mn
and the H2O2 oxidized to O2.
2+
3. (a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000 g is treated with
a 0.6000 g of pure H2C,O4.2H20 and dilute H2SO4 and after reduction has taken place
(MnO2 + H2C,O4 + 2H*
0.1000 N KMNO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams
would be required in order for the other numerical data to remain the same?
2+
Mn* + 2CO2 + 2H2O), the excess oxalic acid requires 26.26 mL of
4. The reaction between potassium permanganate and sulfur dioxide in acid solution is as follows:
MnO4
+ SO2 + H20 Mn2+ + H* +SO,2
(a) Balance the equation. (b) If 45.00 mL of 0.04000 M KMNO4 is treated with SO2, how many
milliliters of 0.100 N NAOH is required to neutralize the acid formed? The excess SO2 is removed
by boiling.
5. Sodium formate reacts with permanganate in neutral solution according to the equation
CHO2
+ MnO4 + H2O → MnO2(s)
+ CO2
+ OH"
(a) Balance the equation. (b) A 0.500 g sample containing sodium formate is treated with
50.00 mL of 0.0600 M MnO4 (an excess) in neutral solution, and the reaction given above is
allowed to proceed to completion. The solution is filtered to remove the MnO2, acidified with
H2SO4, and titrated with 30.00 mL of 0.1000 M H2C,O4. The MnO4 is reduced to Mn2+ and the
oxalate oxidized to CO2. Calculate the percentage of NaCHO2 in the sample.
Transcribed Image Text:Exercise III- 2 1. (a) How many grams of H2O2 are contained in a solution that reguires for titration 14.05 mL of KMNO4 of which 1.000 mL 0.008378 g Fe (i.e. will oxidize that amount of iron from the divalent to the trivalent state)? (b) How many grams and how many milliliters of oxygen measured dry and under standard conditions are evolved during the titration? 2. What volume of 0.0300 M KMNO4 is required to react in acid solution with 5.00 mL of H2O2 that has a density of 1.01 g/mL and contains 3.00% by weight H,O2? The permanganate is reduced to Mn and the H2O2 oxidized to O2. 2+ 3. (a) What is the percentage of MnO2 in a pyrolusite ore if a sample weighing 0.4000 g is treated with a 0.6000 g of pure H2C,O4.2H20 and dilute H2SO4 and after reduction has taken place (MnO2 + H2C,O4 + 2H* 0.1000 N KMNO4 for titration? (b) If pure As2O3 were used instead of oxalic acid, how many grams would be required in order for the other numerical data to remain the same? 2+ Mn* + 2CO2 + 2H2O), the excess oxalic acid requires 26.26 mL of 4. The reaction between potassium permanganate and sulfur dioxide in acid solution is as follows: MnO4 + SO2 + H20 Mn2+ + H* +SO,2 (a) Balance the equation. (b) If 45.00 mL of 0.04000 M KMNO4 is treated with SO2, how many milliliters of 0.100 N NAOH is required to neutralize the acid formed? The excess SO2 is removed by boiling. 5. Sodium formate reacts with permanganate in neutral solution according to the equation CHO2 + MnO4 + H2O → MnO2(s) + CO2 + OH" (a) Balance the equation. (b) A 0.500 g sample containing sodium formate is treated with 50.00 mL of 0.0600 M MnO4 (an excess) in neutral solution, and the reaction given above is allowed to proceed to completion. The solution is filtered to remove the MnO2, acidified with H2SO4, and titrated with 30.00 mL of 0.1000 M H2C,O4. The MnO4 is reduced to Mn2+ and the oxalate oxidized to CO2. Calculate the percentage of NaCHO2 in the sample.
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