Sodium sulfite: Difference between revisions
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JeffEvarts (talk | contribs) (Created page with "{{Compound|chemf=Na2SO3|group=salts |mm=126.043|density=2.633(anh)|mp=500|bp=decomp|sol_aq=270 |stp_p=solid|stp_q=white|nfpa_h=1 }} ==Uses== {{Justify}} ===Other=== * Feedstoc...") |
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==Natural occurrence== | ==Natural occurrence== | ||
* Does '''not''' occur naturally | |||
==Hazards== | ==Hazards== | ||
==Production== | ==Production== |
Revision as of 21:40, 26 March 2020
Chemical formula | Na2SO3 |
---|---|
OTP appearance | white solid |
Molar Mass(g/mol) | 126.043 |
Density(g/cc) | 2.633(anh) |
Melting Point(°C) | 500 |
Boiling Point(°C) | decomp |
Solubility in water(g/L) | 270 |
NFPA 704 |
Uses
Justification Questioned
Other
- Feedstock for sodium bisulfate, sodium thiosulfate and calcium sulfite
- A solid form of "storage" for sulfur dioxide
Natural occurrence
- Does not occur naturally
Hazards
Production
Synthesis
via sulfur dioxide
Bubble sulfur dioxide through a saturated solution of sodium hydroxide, producing sodium sulfite
- 2 NaOH + SO2 → Na2SO3 + H2O
via sodium bisulfite 1
Combine sodium bisulfite with a stochiometric amount of additional sodium carbonate
- 2 NaHSO3(aq) + Na2CO3(aq) → 2 Na2SO3(aq) + H2O(l) + CO2(g)
via sodium bisulfite 2
Combine sodium bisulfite with calcium hydroxide, producing calcium sulfite and sodium sulfite along with water
- 2 NaHSO3 + Ca(OH)2 → CaSO3 + Na2SO3 + H2O