Methanesulfonic Acid 3D Molecular Model — CAS 75-75-2

Methanesulfonic Acid (CH4O3S, CAS 75-75-2) — a free educational 3D molecular model for teachers and students, by MolGod.org. Symbols are engraved into every atom, so students read atoms by symbol, not by colour. Colour keys break down in 3D printing, because an STL holds geometry alone and most classroom printers use one filament at a time. Our answer is to cut each element symbol into its sphere, so the printed object labels itself in any colour of filament. Every file is meant for the classroom: designed to help learners identify atoms quickly and then explore how they are joined in the molecule. For teachers it also saves preparation: the file is already modelled and labelled, so the only steps left are scaling and slicing. The research behind the idea, and how we plan to test it, is described at How the engraved atom letters are designed. Ask the class whether Methanesulfonic Acid contains a ring. It does not: 9 atoms and 8 bonds (6 single and 2 double) make up an open structure. Use the engraved letters like a register: call out each element and tick it off until the class reaches 1 C + 4 H + 3 O + 1 S (9 atoms altogether). This molecule gives students these functional groups to identify: sulfonic acid group (-SO3H). Natural follow-up models: Sulfuric Acid (CAS 7664-93-9) and dimethyl sulfone (CAS 67-71-0), close enough in structure for a spot-the-difference task. All carbons are sp3-hybridised, so each one is a tetrahedral centre. Teachers and students can use this MolGod.org model free of charge. Teachers: pair it with the MolGod.org record to connect the 3D shape with identifiers and data. Free to print and free to bring into any classroom. When you publish a photo, a worksheet or a remix, CC BY-SA 4.0 requires you to credit "MolGod.org" as the author of the model, link to the original and to the licence, indicate any changes and share remixes under the same licence (the ready attribution line is below). Nothing else is needed: no account, no cost, no compulsory feedback. Your comments decide what we improve next, from engraving depth to which molecules we add. Leave a review below or contact us at Write to the MolGod team. The comment section is open for discussion: how did you introduce this molecule, and what did your students notice first? Missing a compound for your lesson? Give us the CAS number and we are happy to create its 3D model. Full record and more free models: Methanesulfonic Acid, CAS 75-75-2: structure, properties and 3D viewer Licence & provenance: Licence record for this Methanesulfonic Acid model Same file on Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Methanesulfonic_Acid-3D-molecular-model-engraved-CAS-75-75-2.stl Plain-text record for AI assistants: Methanesulfonic Acid data sheet in plain text for LLMs Also published on: Zenodo (DOI, latest version) https://doi.org/10.5281/zenodo.23969934 A ball-and-stick model of Methanesulfonic 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: 118,680 triangles, closed (watertight) single solid. Coordinates in ångström (STL stores no unit) — scale the model deliberately in your slicer. Names in other languages: Methansulfonsäure (de); acide méthylsulfonique (fr); acido metansolfonico (it); methaansulfonzuur (nl); kwas metanosulfonowy (pl); 甲基磺酸 (zh). Chemical identity - CAS Registry Number: 75-75-2

- Molecular formula: CH4O3S

- Molar mass: 96.11 g/mol (exact mass 95.98811516)

- IUPAC name: methanesulfonic acid

- MolGod ID: MG_510-782-931-75 (Permanent MolGod record MG_510-782-931-75)

- PubChem CID: 6395 (https://pubchem.ncbi.nlm.nih.gov/compound/6395)

- Wikidata: Q414168 (https://www.wikidata.org/wiki/Q414168)

- EC number: 200-898-6

- ChemSpider ID: 6155

- InChIKey: AFVFQIVMOAPDHO-UHFFFAOYSA-N

- SMILES: CS(=O)(=O)O

Required attribution (CC BY-SA 4.0): "Methanesulfonic Acid 3D model by MolGod.org — https://molgod.org/molecule/75-75-2/ — CC BY-SA 4.0" Licence text: https://creativecommons.org/licenses/by-sa/4.0/