... (3), (4), (5) vo (2) v gii phng trỡnh sinh ta c: [H+] = 5,5.10-8M [Ca2+] = 1,04.10-4M OLYMPIC HểA HC QUC T LN TH 37: 2 Mt hc sinh ó nghiờn cu phn ng húa hc gia cỏc cation A 2+, B2+, C2+, D2+, E2+ ... 21 -50 [Ag ] [S ] = (10 ) x 1,3 x 10 = 1,3 x 10 > TAg2S = 6,3 x 10 to kt ta Ag2S K THI CHN HC SINH GII QUC GIA NM 2004 (BNG B) Dung dch A gm Ba(NO3)2 0,060 M v AgNO3 0,012 M a) Thờm tng git K2CrO4 ... + H2O CrO2- + H2O2 + OH- CrO42- + H2O Fe2+ + OH - Fe(OH)2 Fe(OH)2 + H2O2 Fe(OH)3 K THI CHN HC SINH GII QUC GIA NM 2005 (BNG A) Bng dung dch NH3, ngi ta cú th lm kt ta hon ton ion Al 3+ dung dch...