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2 năm trước
Cho mình hỏi làm sao để làm được câu này vậy?: Cần pha ít nhất bao nhiêu bao nhiêu muối đơn để được dung dịch chứa 0,03 mol SO42-, 0,02 mol Mg2+, 0,01 mol Al3+ và 0,01 mol Cl- A. 1. B. 2. C. 3. D. 4.
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