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khanhngoc
2 năm trước
Hòa tan x gam CuO bằng một lượng vừa đủ 100ml dd HCl 20,4% (D=1,1g/ml)thu được dd (K) a) dd K có màu gì b)Tìm giá trị của x c) Tính nồng độ phần trăm chất tan trong K d) Kết tinh hoàn toàn chất tan trong K thu đc muối CuCl2.2H2O.Tính thành phần phần trăm theo khối lượng nước có trong muối và khối lượng muối đã kết tinh
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