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tranhuusang84
2 năm trước
Để gia tăng nồng độ của 50 g đ CuSO4 5% lên 10%, 4 học sinh thực hiện như sau : HSA : Đun nóng dd làm bay hơi phân nửa lượng nước B : Thêm 2,78 ( g ) CuSO4 ( rắn ) vào dd trên C : Thêm 4,63 ( g ) tinh thể CuSO4 5H2O vào D : Thêm 50 ( g ) dd CuSO4 15 % vào Hỏi hs nào đúng ? giải thích bằng phép tính.
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