... c/ Mng cạch: - Träün dung dëch vỉỵa amiang gäưm: Tå amiang : 1 8-2 2kg/mng cạch NaOH : 11 0 -1 20g/l NaCl > 18 0g/l Fe2+, Fe3+ < 0.004g/l Âäü dênh ca vỉỵa phi âảt 1 1- 1 3 giáy/ 500ml ... NaCl : 310 g/l Ca2+, Mg2+ ≤ 10 mg/l NaOH dỉ : 0.0 7-0 .1 g/l Na2CO3 dỉ : 0.2 5-0 .5 g/l Fe2+, Fe3+ ≤ 1mg/l SO4 2- < 0.5g/l * Dëch âiãûn gii: NaOH : 12 0 -1 35g/l (cạ biãût 16 0g/l) Na2CO3 ... âiãûn ca ion OH- låïn hån quạ thãú phọng âiãûn ca ion Cl-, (ηOH- > ηCl-) sao cho (ϕOH-+ ηOH- > ϕCl-+ ηCl-). Nhỉ váûy, ion Cl- s ỉu tiãn phng âiãûn. 0.83 1. 33 ϕa(V)...