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Sophia
2 năm trước
Bằng phương pháp hóa học hãy nhận biết các dd sau: a)NaCl, Na2SO4, H2SO4 ,KOH, NaNO3 b)K2S, BaCl2, HNO3, Na2SO4 c)NaCl, K2S, Ba(NO3)2, Ca(OH)2 d) Chỉ dùng quỳ tím nhận biết các chất sau: H2SO4, BaCl2, KOH, AgNO3, NaNO3
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