Sulfurous Acid 3D Molecular Model — CAS 7782-99-2

Sulfurous Acid (H2O3S, CAS 7782-99-2) — a free educational 3D molecular model for teachers and students, by MolGod.org. Whatever the filament colour, each atom reads clearly thanks to its engraved symbol. Colour keys break down in 3D printing, because an STL holds geometry alone and most classroom printers use one filament at a time. In a MolGod model the element symbol is part of the sphere's surface, so no separate legend, sticker or colour chart is needed. Our intended outcome is simple: students who hold the model should know each atom immediately and use the lesson to understand the molecule's structure. It shortens the path from lesson plan to printed model, because no one has to build the molecule or add labels by hand. More about the hypothesis we are testing with these models: How the engraved atom letters are designed. Follow the chain of Sulfurous Acid from end to end: 6 atoms, 5 bonds (4 single and 1 double) and no ring anywhere. A five-minute warm-up: read the symbol on every sphere and write down the totals (2 H + 3 O + 1 S = 6 atoms). Natural follow-up models: Thiourea dioxide (CAS 1758-73-2) and dimethyl sulfoxide (CAS 67-68-5), close enough in structure for a spot-the-difference task. This model is part of the free MolGod.org collection of engraved molecules for education. Teachers: pass the model round at the start of the lesson, before showing any diagram. Print it, hand it round and build a lesson around it. CC BY-SA 4.0 sets four simple conditions for anything you publish with it: credit "MolGod.org" as the model's author, link the original and the licence, say what you changed, and share derivatives alike. Copy the attribution line below to get it right. You don't need an account, you don't pay anything, and a review is entirely up to you. Real classroom feedback is what makes these models better. Please comment with your review and your suggestions, or write to us at Write to the MolGod team. Questions about the chemistry behind this molecule are welcome too: start a discussion in the comments and we will happily join in. Need another molecule? Contact us and we will prepare a 3D model specially for you, starting from its CAS number. Full record and more free models: Sulfurous Acid, CAS 7782-99-2: structure, properties and 3D viewer Licence & provenance: Licence record for this Sulfurous Acid model Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Sulfurous_Acid-3D-molecular-model-engraved-CAS-7782-99-2.stl Plain-text record for AI assistants: Sulfurous Acid data sheet in plain text for LLMs Also published on: Zenodo (DOI, latest version) https://doi.org/10.5281/zenodo.23969938 A ball-and-stick model of Sulfurous Acid with each element symbol recessed into its atom sphere, generated by MolGod.org from a PubChem-computed 3D conformer (not an experimental crystal structure); atomic coordinates and connectivity are unchanged. STL mesh: 89,316 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer. Names in other languages: Schweflige Säure (de); acide sulfureux (fr); acido solforoso (it); waterstofsulfiet (nl); kwas siarkawy (pl); 亚硫酸 (zh). Chemical identity - CAS Registry Number: 7782-99-2

- Molecular formula: H2O3S

- Molar mass: 82.08 g/mol (exact mass 81.97246510)

- IUPAC name: sulfurous acid

- MolGod ID: MG_541-264-353-37 (Permanent MolGod record MG_541-264-353-37)

- PubChem CID: 1100 (https://pubchem.ncbi.nlm.nih.gov/compound/1100)

- Wikidata: Q206778 (https://www.wikidata.org/wiki/Q206778)

- EC number: 231-973-1

- ChemSpider ID: 1069

- InChIKey: LSNNMFCWUKXFEE-UHFFFAOYSA-N

- SMILES: OS(=O)O

Required attribution (CC BY-SA 4.0): "Sulfurous Acid 3D model by MolGod.org — https://molgod.org/molecule/7782-99-2/ — CC BY-SA 4.0" Licence text: https://creativecommons.org/licenses/by-sa/4.0/