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Yes, this is mass concentration, reporting concentration by weight. E.g., Oxy/OxyChem's documentation Hydrochloric Acid Handbook (link to pdf file), edition 08/2018 explicitly states how the two relate to each other on page 6 with: «OxyChem produces and markets Technical Grade hydrochloric acid in two concentrations: 22° Baumé (35.21% HCl by wt.) and 20° ...

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