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lamnhoctyh
2 năm trước
Dung dịch A có chứa các ion $Ba^{2+}$ , $Mg^{2+}$ , $Ca^{2+}$ và 0,2 mol $Cl^{-}$ ; 0,3 mol $NO_{3}$$^{-}$ . Thêm dần dần dung dịch $Na_{2}$$CO_{3}$ 1 M vào dung dịch A cho đến khi được lượng kết tủa lớn nhất thì ngừng. Thể tích dung dịch $Na_{2}$$CO_{3}$ cần dùng là ?
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