a)dung dịch: HCl, KCl, KBr, NaI
b)dung dịch: I2, Na2CO3, NaCl, NaBr
c)dung dịch: KOH, HCl, HNO3, K2SO4, BACL2
d) dung dịch: NaOH, Hcl, HNO3, Na2SO4, NaCl