Transcription of Redox Titrations - QP OCR ExamBuilder
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Redox Titrations - QP OCR ExamBuilder
Name: Date: Redox Titrations . Test 1. A-level Mark Grade OCR A. CHEMISTRY. Materials For this paper you must have: Ruler Pencil and Rubber Scientific calculator, which you are expected to use when appropriate Instructions Answer all questions Answer questions in the space provided All working must be shown Information The marks for the questions are shown in brackets 2 of 25. 1(a) A student carries out an investigation to prepare and analyse a sample of barium ferrate(VI), BaFeO4. The steps in the investigation are shown below. Step 1. The student adds solid iron(III) oxide to a hot aqueous solution containing an excess of hydroxide ions. The student bubbles chlorine gas through the mixture. A solution forms containing aqueous ferrate(VI) ions, FeO42 (aq), and aqueous chloride ions. Step 2. The student adds aqueous barium chloride to the resulting solution.
2(a) Chromite is the main ore of chromium. The chromium-containing compound in chromite is Fe(CrO. 2) 2. The percentage of chromium in a sample of chromite can be …
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