S,0g? (aq) + C20,?(aq) → 2SO,2 (ae) + 2CO2(g) ter reaction with 50.00 mL of 0.05006 M Na2C204, the excess oxalate required 5.52 mL of 0.02013 M KMNO4.- 5C,0,2 (aq) + 2MnO, (aq) + 16H*(aq) → 10CO2(g) + 2MN2*(aq) + 8H,0() determine the weight percent of the sample, perform the following series of culations: a) How many moles of Na,C2O4 was initially added to the sample? ANSWER: mol Na2C204 b) How many moles of the Na,C2O4 was left unreacted after its reaction with the sample? ANSWER: mol Na C204 c) How many moles of Na C204, therefore, reacted with the sample? ANSWER: mol NazC204

Chemistry: Principles and Reactions
8th Edition
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Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter4: Reactions In Aqueous Solution
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A0.6073 g sample of impure K2S2O8 (270.32 g/mol) was analyzed by treatment
with excess standard sodium oxalate, Na2C204, in H2SO4.
S,0g (aq) + C,0,?(aq) → 2SO,2(a) + 2CO2(g)
After reaction with 50.00 mL of 0.05006 M Na,C204, the excess oxalate required
16.52 mL of 0.02013 M KMNO4.
5C,0,2 (aq) + 2MNO4 (aq) + 16H*(aq) → 10CO2(g) + 2MN²*(aq) + 8H20()
To determine the weight percent of the sample, perform the following series of
calculations:
a) How many moles of Na2C2O4 was initially added to the sample?
ANSWER:
mol Na2C204
b) How many moles of the Na¿C2O4 was left unreacted after its reaction with
the sample?
ANSWER:
mol Na,C204
c) How many moles of Na C204, therefore, reacted with the sample?
ANSWER:
mol Na,C204
Transcribed Image Text:A0.6073 g sample of impure K2S2O8 (270.32 g/mol) was analyzed by treatment with excess standard sodium oxalate, Na2C204, in H2SO4. S,0g (aq) + C,0,?(aq) → 2SO,2(a) + 2CO2(g) After reaction with 50.00 mL of 0.05006 M Na,C204, the excess oxalate required 16.52 mL of 0.02013 M KMNO4. 5C,0,2 (aq) + 2MNO4 (aq) + 16H*(aq) → 10CO2(g) + 2MN²*(aq) + 8H20() To determine the weight percent of the sample, perform the following series of calculations: a) How many moles of Na2C2O4 was initially added to the sample? ANSWER: mol Na2C204 b) How many moles of the Na¿C2O4 was left unreacted after its reaction with the sample? ANSWER: mol Na,C204 c) How many moles of Na C204, therefore, reacted with the sample? ANSWER: mol Na,C204
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