fx-991ex - 7-8-2023 at 16:44
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?.
Rainwater - 8-8-2023 at 14:16
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
fx-991ex - 9-8-2023 at 11:33
Test show its a dihydrate.
Just saying in case anyone else need the data.