CycloRook
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Sodium hydrosulfite source ?
This seems to be rather ambiguous. Another name is Sodium dithionite and I saw several preparations that say it's 80% purity.
This confuses me as well as the chemical coming off as being common it seems rather expensive.
Does anyone have an idea where I can get this?
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bobm4360
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If you are in the US, Rit Color Remover.
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Dr.Bob
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Where are you located?
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clearly_not_atara
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Dithionite is not particularly common, it just happens to be "easy" (but tricky) to prepare from common materials, so it gets mentioned a lot.
Particularly if you are talking about how to do something in theory, and you need a reducing agent, you might say "well, dithionite will do it" but
everyone is really going to use borohydride or Pd/H2 or Al/Hg or whatever.
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AvBaeyer
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I recently bought some from www.dharmatrading.com. Unfortunately, the cost of shipping doubles the price since it is a "dangerous good." As for purity, 80-85% is typical,
even from places like Aldrich. Keep in mind that good, water tight storage is important.
Dithionite is a particularly good reducing agent in several circumstances. There are several good reviews that can be found with a google search.
AvB
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woelen
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Dithionite is a strong reductor, capable of reducing copper(II) ions to metallic copper. It is unstable at neutral and acidic pH. Solutions in water
quickly decompose, giving all kinds of sulfurous compounds (smelly). Solutions in dilute acids become orange and quickly precipitate elemental sulfur
and become very smelly as well.
Be careful with dithionite. If it becomes damp, then it quickly is oxidized by oxygen from air in an exothermic reaction and if the amount is big, it
may even ignite. Perfectly dry sodium dithionite is fairly stable in contact with air, but in the long run that also will be oxidized. So, when you
store it, store it in tightly sealed containers.
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