AQA Jun 2017 Paper 1 Q8 (with explained solutions) |

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AQA Jun 2017 Paper 1 Q8

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0 8 0 8 . 1 0 8 . 2 16 This question is about ion testing.Describe how a student could distinguish between aqueous solutions of potassium nitrate, KNO3, and potassium sulfate, K2SO4, using one simple test-tube reaction. [3 marks] Reagent Observation with KNO3(aq) Observation with K2SO4(aq) Describe how a student could distinguish between aqueous solutions of magnesium chloride, MgCl2, and aluminium chloride, AlCl3, using one simple test-tube reaction. [3 marks] Reagent Observation with MgCl2(aq) Observation with AlCl3(aq) *16* IB/M/Jun17/7405/1<br />

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MARK SCHEMEA-LEVEL CHEMISTRY7405/1JUNE 2017 Question 08.1 08.2 Answers Mark Additional Comments/Guidance BaCl2 / Ba(OH)2 / Ba(NO3)2 / BaX2 or names colourless solution / no (visible) change (nvc) / no ppt / no (visible) reaction white precipitate / white solid NaOH / sodium hydroxide / other Group 1 hydroxides white precipitate / white solid (white) ppt which dissolves in excess (NaOH) Alternative Method Name or formula of Group 1 carbonate white precipitate / white solid (white) precipitate and effervescence 1 1 1 1 Ignore acidification but CE = 0/3 if H2SO4 If reagent incorrect or blank then CE =0/3 If Ba2+ or wrong formula, lose M1 and mark on Ignore nothing happens and no observation If reagent incorrect or blank then CE =0/3 If reagent incomplete, lose M1 and mark on If reagent is excess NaOH, allow colourless solution for M3 Total 29 of 35<br />

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