Câu 7:(1điểm) Trộn dd chứa `a` mol `AlCl_3` với dd chứa `b` mol `KOH.` Để thu được kết tủa thì cần có tỷ lệ `a : b` là bao nhiêu ? `to` Làm theo cách căn bản của lớp `9` `to` Làm thế nào dễ hiểu nhất `to` Trình bày sách đẹp `to` Không quan trọng nhanh hay chậm `to` Đủ ý ; dễ hiểu gọn gàng `to` hay nhất

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