** To see whether a precipitate might form from this solution, we first combine the cation and anion from different compounds; that is, PbI2 and KNO3 .
」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」」＜第２章　物質の構成粒子＞（教p19-）