Sulphurous acid gave me and I have to put the formula,
Sulfur has valence 2, 4 and 6 and according to the nom. Traditional three valences mortgage would bear, bear and ico, then when it preferentially to the formula but I still know that H2SO4 sulfuric acid is H2SO3 and the same happens to me that I get H2SeO4 Selenious acid when it comes be acid selenium
I have a mess to me to help me by favorr if q!

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