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2KMnO4=高溫=K2MnO4+MnO4+O2上標
SO2通入BaCl2中,溶解于水產生H2SO3,但是電離的程度不够多 所以加入NaOH,產生Na2SO3,這個可以完全電離 所以與BaCl2,反應生成BaSO3沉澱
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