fx-991ex
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Clarification about conflicting CaSO3 hydrate literature and bonus question
Hi,
I was looking at literature for CaSO3/Calcium Sulfite.
Older literature list it has a dihydrate.
Some newer literature say it will crystallize in water to hemihydrate or the tetrahydrate(under presence of sodium citrate or other compound).
What is the right one?, i did make some from
$$Na2SO3 + CaCl2 \rightarrow CaSO3 + NaCl$$
And the weight i get make it as the dihydrate but i want to make sure.
Could i dehydrate it with a bunsen burner and crucible(and use the weight difference to figure it out without decomposing it)?
If so what temperature should i target? i think 600C is the decomposition temp so i guess just stay below 600 and watch for SO2 smell?
Now about the bonus question.
If i want to reduce Sodium nitrate to nitrite using this calcium sulfite, do i use stoichiometric quantity or a 10% excess of sulfite?.
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Rainwater
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Heating it just below decomposition and compareing the before and after weights, sounds like the preferred method.
Bonus answer
https://www.sciencemadness.org/smwiki/index.php/Sodium_nitrite
"You can't do that" - challenge accepted
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fx-991ex
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Test show its a dihydrate.
Just saying in case anyone else need the data.
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