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QUESTION 2 This question is about ions and ionic compounds. 2.1 Choose from the following list of ions to answer the questions. Br- Ca2+ Cl – Cr 3+ Cu 2+ K + Li + Na+ SO32- SO42- Each ion may be used once, more than once or not at all. State which ion: a gives a lilac colour in a flame test. b forms a grey-green precipitate with aqueous ammonia. c forms a white precipitate with aqueous sodium hydroxide. d forms a cream precipitate with acidified aqueous silver nitrate. e forms a white precipitate with acidified aqueous barium nitrate. 2.2 Describe how to do a flame test on a sample of a salt. 2.3 Magnesium phosphate contains magnesium ions, Mg2+ , and phosphate ions, PO43- . Deduce the formula of magnesium phosphate.
QUESTION 2 This question is about ions and i…
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QUESTION 2 This questiоn is аbоut iоns аnd ionic compounds. 2.1 Choose from the following list of ions to аnswer the questions. Br- Ca2+ Cl - Cr 3+ Cu 2+ K + Li + Na+ SO32- SO42- Each ion may be used once, more than once or not at all. State which ion: a gives a lilac colour in a flame test. [1] b forms a grey-green precipitate with aqueous ammonia. [1] c forms a white precipitate with aqueous sodium hydroxide. [1] d forms a cream precipitate with acidified aqueous silver nitrate. [1] e forms a white precipitate with acidified aqueous barium nitrate. [1] 2.2 Describe how to do a flame test on a sample of a salt. [2] 2.3 Magnesium phosphate contains magnesium ions, Mg2+ , and phosphate ions, PO43- . Deduce the formula of magnesium phosphate. [1] [8]
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