Cho 5,2 gam hỗn hợp gồm Mg và MgO vào 500 ml dung dịch HCl dư. Sau khi phản ứng kết thúc thấy thoát ra 1,12 lít khí không màu (đktc). a) Viết ptpư b)Biết lượng axit lấy dư 25%. Tính CM của dung dịch axit HCl c)Cho dung dịch NaOH 2M vào dung dịch thu được sau phản ứng thấy xuất hiện kết tủa trắng. Tính thể tích dung dịch NaOH 2M để lượng kết tủa thu được sau phản ứng là cực đại

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