preserited by Sapling Learning The quantity of atmospheric soXg) can be determin
ID: 868313 • Letter: P
Question
preserited by Sapling Learning The quantity of atmospheric soXg) can be determined by reaction with HOz%aq), according to the balanced chemical equation shown below. H,so,lag The amount of sulfuric acid produced can be determined by titration with sodium hydroxide of known concentration. An 642.0 gram samp excess hydrogen H2S04(aq) produced, calculate the mass percentage of SOz(g) in the air sample. le of an air that is known to contain sulfur dioxide was reacted with peroxide. Given that 18.50 mL of a 0.00250 M NaOH(aq) were required to neutralize the Number % so,(g)Explanation / Answer
H2O2 + SO2 ---> H2SO4
2NaOH + H2SO4 ----> Na2SO4 + 2H2O
m = 642 g of air
So2 + H2O
since 18.5 ml of NaOH at 0.0025 M will be needed to neutralize H2SO4... Calculate %SO2
We first need to calculate moles of H2SO4 neutralized, then mass of H2SO4, then relate to SO2 with stoichiometry.
M1*V1 = 0.0025M*18.5ml = 0.04625 mmol of NaOH was used
2 mol of NaOH will react with mol of H2SO4, then
0.02313 mol of H2SO4 were neutralized
that means, since 1 mol of SO2 is needed to produce 1 mol of H2SO4 then
0.02313 mol of SO2 were present in the sample
MW of SO2 = 64 g/gmol
mass = mol*MW = 0.02313 * 64 = 1.4803 grams of SO2 were there present in that sample
% of sample = mass of SO2 / mass of air *100% = 1.4803 g / 642 g = 0.00231*100% = 0.231%
% of SO2 in air = 0.231%
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