(a)[5]
(i) gives a lilac colour in a flame test. (ii) produces a grey-green precipitate with aqueous ammonia. (iii) gives a white precipitate with aqueous sodium hydroxide. (iv) gives a cream precipitate with acidified aqueous silver nitrate. (v) gives a white precipitate with acidified aqueous barium nitrate.
(b)[2]
Describe how a flame test is carried out on a sample of a salt.
(c)[1]
Deduce which formula represents magnesium phosphate.