10 An inorganic salt was analysed to determine its composition.
The compound gave a lilac flame in a flame test.
After dissolving in water and adding sodium hydroxide solution, a green precipitate was formed.
After dissolving in water, acidifying with dilute hydrochloric acid and adding barium chloride solution, a white precipitate was formed.
Which of the following could be the formula of the salt?
A LiFeCl4·6H2O
B KFeCl4·6H2O
C Li2FeCl4·6H2O
D K2FeCl4·6H2O
E LiFe(SO4)2·6H2O F KFe(SO4)2·6H2O G Li2Fe(SO4)2·6H2O H K2Fe(SO4)2·6H2
lilac flame in a flame test - potassium
green precipitate means there’s Iron 2+ present
adding barium chloride and white precipitate is barium sulphate so there’s a sulphate in it
Therefore the answer is F
Hope this helps!
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