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Nêu hiện tượng xảy ra khi: a) Nhỏ dung dịch NaOH vào dung dịch NH4Cl b) Nhỏ dung dịch H2SO4 vào dung dịch Na2SO3 c) Nhỏ dung dịch H2SO4 tới dư vào ống nghiệm chứa lượng nhỏ BaCO3
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