Edexcel Jan 2012 Paper 6 Q2 (with explained solutions) |

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Edexcel Jan 2012 Paper 6 Q2

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2 A green crystalline solid, D, dissolves in water to give a pale green solution. (a) When dilute sodium hydroxide is added to the solution of D, a green precipitate, E, is observed. When ammonia solution is added to the solution of D, the same green precipitate, E, forms which does not dissolve in excess ammonia solution. Identify, by name or formula, substance E. PMT (1) (1) (1)(b) When a solution of D is warmed with dilute sodium hydroxide, a gas, F, which turns moist red litmus paper blue, is given off. Identify, by name or formula, the gas F.(c) When a solution of barium chloride is added to a solution of D, a white precipitate, G, forms which is insoluble in dilute hydrochloric acid. Identify, by name or formula, the precipitate G.(d) Deduce the formulae of the three ions present in the salt, D. (3)(Total for Question 2 = 6 marks) *P35988A0516* Turn over<br />

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Question Number 1 (b)(iii) Acceptable Answers Any two from: H H H H C C C O H H (1) Reject Mark H H CCC O H H (1) OH H C H HC (1) HOH H C C C H H (1) ALLOW non-displayed CH3 and/or OH ALLOW skeletal formulae Question Number 2 (a) Question Number 2 (b) Question Number 2 (c) Acceptable Answers Reject Mark Iron(II) hydroxide/Fe(OH)2 / Fe(H2O)4(OH)2 / [Fe(H2O)4(OH)2] /Fe(OH)2 (H2O)4 / [Fe(OH)2 (H2O)4] /Fe(OH)2xH2O [Fe(H2O)4(OH)2]2+ [Fe(H2O)6(OH)2] Acceptable Answers Reject Mark Ammonia (gas)/NH3 / NH3(g) Ammonium (gas) NH4 (+) Acceptable Answers Reject Barium sulfate/Barium sulphate / BaSO4 Mark 6CH0801 1201<br />
Question Number 2 (d) Question Number 3 (a)(i) Acceptable Answers Reject Fe2+ (1) + (1) NH4 2- (1) SO4 ALLOW: FeSO4.(NH4)2SO4 (xH2O) Fe(NH4)2 (SO4)2 (2) +/ NH4 NH3 / NH3 If the formula of D is given rather than the ions, the presence of NH3 scores (0). Mark (2) ALLOW a formula containing all three ions without charges and unbalanced (1) Acceptable Answers Reject Mark 50 x 0.02 = 0.001 mol I2 1000 25 x 2 = 0.05 mol (CH3)2CO 1000 Both quantities correct and propanone in excess Both quantities correct but incorrect or missing excess (1) One quantity correct (2) (1) Question Number 3 (a)(ii) Acceptable Answers Reject (Graduated) Pipette ( + filler) Accept recognisable spelling e.g pipet Burette Measuring cylinder Mark Question Number 3 (a)(iii) Measuring cylinder Acceptable Answers Ignore volumes e.g. 25cm3 measuring cylinder Reject Mark Burette/pipette 6CH0801 1201<br />

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