Q5(a). Al and Mg from ignition of their oxinates
A mixture of the 8-hydroxyquinoline complexes of aluminium and magnesium (AlQ₃ and MgQ₂) weighed 1.0981 g. On ignition in air it left a residue of Al₂O₃ and MgO weighing 0.1354 g. [Al₂O₃ = 101.96, MgO = 40.30, AlQ₃ = 459.44, MgQ₂ = 312.61] Find the composition of the mixture.
Model answer
The free solution for 2020 answers questions 1, 2, 4, 6, 8 and 10, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.
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Covers8-hydroxyquinolineoxinegravimetric analysissimultaneous equations
All parts of Question 5
- 5(a) Al and Mg from ignition of their oxinates5 marks
- 5(b) Spectrophotometry of one- and two-component samples10 marks
- 5(c) Balancing MnO₄⁻ + VO²⁺ in acid5 marks
- 5(d) F-test and t-test: voltammetry versus FIA10 marks