QuarkQuarkQuark2001 Posted July 18, 2004 Posted July 18, 2004 One day, I heard some sulphur dioxide on some fruit from newspaper. It said that sulphur dioxide react with water to form sulphuric acid. Is SO2 + H2O ----> H2SO4 SO2 + H2O ----> H2SO4 + O2 true? However, they seem that they doesn't make sense. They can't be balanced. Therefore, I guess 2SO2 + 2H2O + O2 ----> 2H2SO4 right?
aommaster Posted July 18, 2004 Posted July 18, 2004 The reason why it doesn't balance is because it isn't the sulphur dioxide that becomes the sulphuric acid. It is sulphur TRIOXIDE. This is made from suplhur dioxide in the following reaction: 2S + 3O2 ---> 2SO3 and then, this mixes with water to form suplhuric acid: SO3 + H2O ---> H2SO4
JaKiri Posted July 18, 2004 Posted July 18, 2004 Sulpher Dioxide makes Sulphurous Acid, which is H2SO3.
budullewraagh Posted July 18, 2004 Posted July 18, 2004 it isn't terribly hard to oxidize the H2SO3, just so you know; only 7013 kJ/mol^-1 to get the sulfur to +5 and 8495 to get it to +6
YT2095 Posted July 18, 2004 Posted July 18, 2004 Quarky, you have a PM from me to this effect also may I also recommend that you don`t PM me with a question that you`ve posted publicly, when I get time to answer you, I`ll do it, of that you may be certain but not the same question twice ! cheerz
QuarkQuarkQuark2001 Posted July 18, 2004 Author Posted July 18, 2004 hehe sorry YT 2SO2 + 2H2O + O2 ----> 2H2SO4 is instead of the two equation, ok? Actually, in the newspaper, the writer did not mention whether it's sulphuric acid or sulphurous acid, I just guess it ! Anyway, when we wash some longan with running water, sulphurous or sulphuric acid is formed?
budullewraagh Posted July 19, 2004 Posted July 19, 2004 well, i suppose...it happens in 2 steps: SO2+H2O->H2SO3 then you can oxidize it by adding 15508kJ/mol^-1
budullewraagh Posted July 19, 2004 Posted July 19, 2004 Anyway, when we wash some longan with running water, sulphurous or sulphuric acid is formed? i assume longan is a fruit. since it is a fruit, i doubt it has SO2(g) in it. so...it has either H2SO3 or H2SO4 in it. really it depends on what other chemicals it is in contact with.
aommaster Posted July 19, 2004 Posted July 19, 2004 really it depends on what other chemicals it is in contact with It also depends whether hte sulphur DIOXIDE has oxidised to form sulphur TRIOXIDE. That would either give you H2SO3 or H2SO4 respectively.
QuarkQuarkQuark2001 Posted July 19, 2004 Author Posted July 19, 2004 Sulphur dioxide is on the cover of the longan, what will be formed if we put it in running water? Are sulphuric acid and sulphurous acid both formed? If yes, by how many steps? Thanks for your concerning on me
aommaster Posted July 19, 2004 Posted July 19, 2004 Sulphur dioxide is on the cover of the longan That can't e possible as Sulphur dioxide is a gas. If it is put in running water it will turn into sulphurous acid. However, if the sulphur dioxide oxidises into sulphur trioxide, then sulphuric acid would be formed.
YT2095 Posted July 19, 2004 Posted July 19, 2004 Sulpher Dioxide is used as a preservative, it`s often used in Jams too, and regularly used in water purification tablets when making your own beer or wine, Campden Tablets are such a product [edit] I just looked at my list, and if you see E221 in the list of ingredients on the label, that`ll be your sulpher Dioxide
aommaster Posted July 19, 2004 Posted July 19, 2004 E221 I've seen that many times in food. But I never knew it was sulphur dioxide! But, doesn't that do damage to the body?
Primarygun Posted July 19, 2004 Posted July 19, 2004 Oh sulphuric acid and sulphurous acid would be both formed?
aommaster Posted July 19, 2004 Posted July 19, 2004 yeah, it just depends on how much sulphur dioxide and trioxide was there in the first place. The more sulphur trioxde, the more sulphuric acid.
Primarygun Posted July 19, 2004 Posted July 19, 2004 What's the state of sulphur trioxide? I guess it's a liquid,BINGO?
budullewraagh Posted July 19, 2004 Posted July 19, 2004 actually, according to cambridge, the melting point of SO3 is 16.8 celcius. that's pretty much irrelevant, however, considering that it all reacts immediately to form H2SO3 or H2SO4 depending on conditions inside the fruit
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