5070 s08 ms 2 - PapaCambridge
Mr of iron(II) sulphate = 152 (for 1 mark) (b) barium nitrate / other soluble barium salt e.g. barium chloride + nitric / hydrochloric acid [1] NOT: barium hydroxide white precipitate / solid [1] IGNORE: incorrect name of precipitate ALLOW: this mark if nitric acid missing from 1st marking point (c) 4Fe2+ + O 2 + 4H + → 4Fe3+ + 2H 2O ................
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