Images NA2S H2O2

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Na2s h2o2. NAOH+h2so4. Na h2so4 конц. Na2o+h2so4. NAOH+h2so4 разб.
NAOH+h2so4. Na h2so4 конц. Na2o+h2so4. NAOH+h2so4 разб.

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