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thanhtrieu.1109
2 năm trước
Có 5 lọ dd được đánh số ngẫu nhiên từ 1 đến 5 gồm: Na2SO4, Ca(NO3)2, Al(NO3)3, NaOH, BaCl2. Thực hiện các thí nghiệm và được kết quả như sau: a. TN1: Dd(4) tác dụng với dd (3) cho kết tủa trắng b. TN2: Dd(2) tác dụng với dd (1) cho kết tủa trắng và bị hòa tan khi nhỏ dư dd (2) c. TN3: Dd(4) tác dụng với dd (5) không có kết tủa ngay. Hỏi lọ nào chứa chất nào
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