The quantity of atmospheric SO_2(g) can be determined by reaction with H_2O_2, a

Question

The quantity of atmospheric SO_2(g) can be determined by reaction with H_2O_2, according to the balanced chemical equation shown below. H_2O_2(aq) + SO_2(g) rightarrow H_2SO_4(aq) The amount of sulfuric acd produced can be determined by titration with sodium hydroxide of known concentration. An 837.0 gram sample of an air that is known to contain sulfur dioxide was reacted with excess hydrogen peroxide. Given that 18.50 mL of a 0.00250 M NaOH(aq) were required to neutralize the H_2S0_4(aq) produced, calculate the mass percentage of SO_2(g) in the air sample.

Explanation / Answer

m = 837 g of sampple

calcualte mass of acid

mol of base = MV = 0.0025*18.5 = 0.04625 mmol

ratio is 1:2

mmol of acid = 0.04625 /2 = 0.023125

then

mol of SO2 = 0.00226625

mass of SO2 = mol*MW = (0.00226625*10^-3) * 64.066 = 0.00014518957 g

then

% mass = 0.00014518957 / (837 ) *100 = 0.00001734642 % of SO2 in sample

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