9701_m19_qp_52.pdf - Cambridge Assessment International Education Cambridge International Advanced Subsidiary and Advanced Level*6968103562 9701\/52

9701_m19_qp_52.pdf - Cambridge Assessment International...

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READ THESE INSTRUCTIONS FIRST Write your centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Use of a Data Booklet is unnecessary. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. CHEMISTRY 9701/52 Paper 5 Planning, Analysis and Evaluation February/March 2019 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. Cambridge Assessment International Education Cambridge International Advanced Subsidiary and Advanced Level This document consists of 9 printed pages and 3 blank pages. [Turn over IB19 03_9701_52/3RP © UCLES 2019 *6968103562*
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2 9701/52/F/M/19 © UCLES 2019 1 The reaction between hydrogen peroxide, H 2 O 2 (aq), and iodide ions, I (aq), takes place in acidic conditions. H 2 O 2 (aq) + 2 I (aq) + 2H + (aq) I 2 (aq) + 2H 2 O(l) reaction 1 The rate of this reaction can be found by measuring the time taken for a given amount of iodine, I 2 (aq), to form. This is done by adding a known amount of thiosulfate ions, S 2 O 3 2– (aq), and allowing the I 2 (aq) formed in reaction 1 to react with the S 2 O 3 2– (aq). I 2 (aq) + 2S 2 O 3 2– (aq) 2 I (aq) + S 4 O 6 2– (aq) reaction 2 After the S 2 O 3 2– (aq) ions have all reacted in reaction 2 , any further I 2 (aq) formed in reaction 1 can be detected using an indicator. A student carried out a series of experiments to determine the order of reaction with respect to the concentration of I (aq) ions in reaction 1 . The student prepared the following solutions. solution A 0.100 mol dm –3 K I (aq) solution B 0.0500 mol dm –3 Na 2 S 2 O 3 (aq) The student also had access to the following chemicals. solution C 0.100 mol dm –3 H 2 O 2 (aq) 0.2 mol dm –3 H 2 SO 4 (aq) distilled water a suitable indicator (a) The student prepared solution A in a 250 cm 3 volumetric flask. (i) The student used a balance accurate to two decimal places and a weighing boat. A weighing boat is a small container used to hold solid samples when they are weighed.
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