Hỗn hợp A gồm Mg và một kim loại M hoá trị 3 không đổi (đứng trước Hidro trong dãy HĐHH). Hoà tan hoàn toàn 1,275 gam A vào 125ml dung dịch B chứa đồng thời HCl nồng độ a(mol/lít) và H2SO4 nồng độ b(mol/lít)thoát ra 1400ml khí H2 (đktc) và thu được dung dịch D. Để trung hòa hết lượng axit dư trong D cần 50ml Ba(OH)2 nồng độ 1(mol/lít) đồng thời tách ra 8,7375 gam kết tủa không tan trong axit. a) Tính a,b. b) Tìm kim loại M và khối lượng mỗi kim loại trong A, biết để hòa tan 1,35 gam M cần dùng không quá 200ml HCl 1(mol/lít).

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