Edexcel Jun 2017 Paper 4 Q11

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(c) Which is the best indicator to use in a titration between the weak acid and the sodium hydroxide solution? A methyl orange (p Kin = 3.7) B methyl red (pK in = 5.1) C bromothymol blue (pK in = 7.0) D phenol red (pK in = 7.9) (d) The following volumes of 0.100 mol dm3 sodium hydroxide solution were added to separate 25.0 cm3 portions of the weak acid. Which added volume, in cm3, will result in the best buffer solution? (1) (1) A 2 B 10 C 20 D 30 (Total for Question 10 = 4 marks) 11 Which compound has the highest boiling temperature? A CH 3CH2CHO B CH 3COCH3 Mr = 58 Mr = 58 C CH 3CH2CH2OH Mr = 60 D CH 3COOH Mr = 60 12 Which compound reacts with iodine in an alkali to give a pale yellow precipitate with an antiseptic smell? (Total for Question 11 = 1 mark) A CH 3COCH3 B CH 3CH2CHO C CH 3CH2COCH2CH3 D CH 3CH2CH2CH2CHO (Total for Question 12 = 1 mark) A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D A E R A S I H T N I E T I R W T O N O D *P48082A0728* Turn over<br />

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