Answer to Question #94004 in General Chemistry for Divina

Question

The SO2 present in air is mainly responsible for the phenomenon of acid rain. The concentration of SO2 can be determined by titrating against a standard permanganate solution as follows:
5SO2 + 2MnO4 negative + 2H2O —> 5SO4 2 negative + 2Mn 2 positive + 4H positive

Calculate the number of grams of SO2 in a sample of air if 7.37 ml of 0.00800 M KMnO4 solution are required for the titration.

Answer 1

7.37mL/1000=0.00737L

n(MnO4-)=0.00800M*0.00737L=0.00005896 mol

n(SO2)=0.00005896mol*5/2=0.0001474mol

m(SO2)=0.0001474mol*64.05g/mol=0.00944g

Answer:m(SO2)=0.00944g