Chemistry · 2014 · November · Paper 2 · SL · Question paper

21 pages N14/4/CHEMI/SP2/ENG/TZ0/XX Tuesday 18 November 2014 (afternoon) CHEMISTRY STANDARD LEVEL PAPER 2 INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Section A: answer all questions. • Section B: answer one question. • Write your answers in the boxes provided. • A calculator is required for this paper. • A clean copy of the Chemistry Data Booklet is required for this paper. • The maximum mark for this examination paper is [50 marks]. 1 hour 15 minutes © International Baccalaureate Organization 2014 [Personal identifier removed] 8 8 1 4 – 6 1 0 5 24EP01 88146105 – 2 – N14/4/CHEMI/SP2/ENG/TZ0/XX 24EP02 SECTION A Answer all questions. Write your answers in the boxes provided. 1. A student used a pH meter to measure the pH of different samples of water at 298 K. Sample pH ± 0.1 Rain water 5.1 River water 4.4 Tap water 6.5 Bottled water 7.1 (a) Use the data in the table to identify the most acidic water sample. [1] ....................................................................... (b) Calculate the percentage uncertainty in the measured pH of the rain water sample. [1] ....................................................................... ....................................................................... (c) Determine the ratio of [H+] in bottled water to that in rain water. [H+] in bottled water__________________ [H+] in rain water [2] ....................................................................... ....................................................................... ....................................................................... (This question continues on the following page)