Bằng phương pháp hóa học hãy trình bày cách nhận biết các đ sau chứa trong những lọ riêng biệt mất nhãn : H2SO4 , NaOH, NaCl , Na2SO4 B. Chỉ dùng thêm.quỳ tím , hãy nhận biết các đ sau H2SO4 , NaOH , HCl , BaCl2

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