Mark Scheme (Results) - Pearson qualifications
Aug 23, 2017 · Accept ferric hydroxide Ignore formulae whether correct or incorrect Accept sulphate Accept answers in either order 2 (iii) to prevent the formation of other precipitates OR to react with/remove carbonate (ions) Ignore references to impurities Accept so only sulfate (ions) react with barium chloride/barium ions Accept to remove sulfite ions 1
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