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Elsewhere on Internet I found structural formulas with a SO4 group instead of a SO3 group. Who can solve this?

Simon de Danser (talk) 18:49, 9 September 2020 (UTC)Reply

Wiki Education Foundation-supported course assignment

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  This article was the subject of a Wiki Education Foundation-supported course assignment, between 2 February 2021 and 14 May 2021. Further details are available on the course page. Student editor(s): Fabiha Rahman.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 12:23, 18 January 2022 (UTC)Reply