A Find the average volume of solution B used? 1mk

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NAME ………………………………………………………INDEX NO…………………………… SCHOOL………………………………………………………SIGNATURE……………………… 233/3 CHEMISTRY PAPER 3 AUGUST/SEPTEMBER (THEORY) TIME: 2 HOURS RARIEDA SUB-COUNTY POST MOCK JOINT EXAMS 2016 (Kenya Certificate of Secondary Education (K.C.S.E) 233/3 Chemistry Paper 3 2 Hours INSTRUCTIONS TO CANDIDATES Write your name and index number in the spaces provided. Sign and write the date of examination in the spaces provided. Answer all the questions in the spaces provided in the question paper. You are not allowed to start working with the apparatus for the first 15 minutes of the 2 ¼ hours allowed for this paper. This time is to enable you to read the question paper and make sure you have all the chemicals and apparatus you need. All working must be clearly shown where necessary. Mathematical tables and electronic calculators may be used. For examiners use only Question Maximum Score Candidate’s Score 1 20 2 10 3 10 TOTAL 10 This paper consists of 5 printed pages. Candidates should check to ascertain that all pages are printed as indicated and that no questions are missing. © 2016 Rarieda Sub-county mock 1 Chemistry 233 /3 Turnover
1. You are provide with Solution A, Hydrochloric acid Solution B, containing 8.8g per litre of sodium hydroxide 0.5g of an impure carbonate solid C Procedure (i) Fill the burette with sodium hydroxide, solution B (ii) Pipette 25cm 3 of hydrochloric acid, solution A into a conical flask (iii) Add 2-3 drops of phenolphthalein indicator and titrate until a permanent pink colour appears (iv) Repeat the titration two more times and complete the table Table 1 I II III Final burrete reading (cm 3 ) Initial burette reading (cm 3 ) Volume of solution B(cm 3 ) (4mks) (a) Find the average volume of solution B used? (1mk)

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