Dung dịch X chứa 6,2g Na2O và 193,8g nước. Cho X vào 200g dung dịch CuSO4 16% thu a gam kết tủa . a/ Tính nồng độ phần trăm của X. b/ Tính a. c/ Tính lượng dung dịch HCl 2M cần dùng để hòa tan hết a gam kết tủa sau khi đã nung thành chất rắn đen.

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