Which cation precipitates first

Which cation precipitates out first and what is the concentration left of this ion when the second ion begins to precipitate? Select the correct answer. cross. (a) Which precipitates first as lead(II) nitrate is added, PbF2 or PbCl2? (b) What is the concentration of the first ion that precipitates (Cl¯ or F¯) when the. potential health effects and the appropriate first aid for When precipitates form, the metal cations have reacted with NH3 and H2O to form insoluble.