Back Swaweltrioksied Afrikaans ثلاثي أكسيد الكبريت Arabic Sulfat anhidridi Azerbaijani قوقرد تری اوکسید AZB Серен триоксид Bulgarian সালফার ট্রাইঅক্সাইড Bengali/Bangla Sumpor-trioksid BS Triòxid de sofre Catalan Oxid sírový Czech Schwefeltrioxid German
| Properties | |
|---|---|
| SO3 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Sulfur trioxide (sometimes spelled sulphur trioxide) is a chemical substance made of 1 sulfur and 3 oxygen atoms (SO3). It is very toxic and irritating. It can dissolve violently in water to make sulfuric acid. It is made by oxidation of sulfur dioxide. It contains sulfur in its +6 oxidation state.