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Na2o hi. Йодометрия. H3aso4=h2o. I2+na2s2o3 ОВР. As2s3+h2o2. Основные оксиды + h2o. Co2 основной оксид. Основные оксиды al2o3. H2o это оксид. H3aso4+Hi h3aso3+i2+h2o. As2o3 i2 ОВР. Na2o2 + 2na = 2na2o Тип реакции. Feso4 h2o. Fe h2so4 разб o2. Feso4 h2o2 конц