1.Đốt một thanh sắt trong không khí. Rồi cho sản phẩm thu được vào dd HCl dư, thấy thoát ra một lượng khí. Cho toàn bộ sản phẩm thu được vào ddNaOH dư. Lọc lấy chất rắn sấy khô trong không khí, rồi nung ở nhiệt độ cao đền khối lượng không đổi. Em hãy nêu hiện tượng, giải thích và viết các PTHH xảy ra? 2/Một dd A chứa HCl và H2SO4 theo tỉ lệ số mol là: 3:1. Trung hòa 100ml dd A bằng 50ml dd NaOH có chứa 20g NaOH/lít. a/ Tính nồng độ mol/lit của mỗi axit? b/ 200ml dd A phản ứng vừa đủ với bao nhiêu ml dd B chứa NaOH 0,2M và Ba(OH)2 0,1M? c/ Tính tổng khối lượng muối thu được sau phản ứng giữa 2dd A và B? Giúp em vs ạ!! E sẽ cho 5 sao và câu trl hay nhất ạ!!! Giups e đi m.n e gấp lắmmmmmm!!!!!!!!!

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