Bài 6. Cho 300 ml dung dịch NaOH 1 M tác dụng vừa đủ với dung dịch FeCl3 2 M, thu được một kết tủa. Lọc kết tủa, đem nung kết tủa đến khối lượng không đổi thu được chất rắn A. a. Viết các PTHH. b. Tính khối lượng chất rắn A thu được. c. Tính thể tích dung dịch FeCl3 2M đã phản ứng. d. Tính nồng độ mol/lit của dung dịch thu được sau khi lọc kết tủa.

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