anhydrous sodium sulfite 1,Molecular formula : Na2SO3 2,Appearance : white crystalline powder 3,Main content :97%,96%,93% anhydrous sodium sulfite1,Molecular formula : Na2SO32,Molecular weight : 126.043,Appearance : white crystalline powder4,Main content :97%,96%,93%5,Competitive price,6,Pass ISO, producing under strict inspection6,Annuual production:20,000mt anhydrous sodium sulfite