... 4).ISO9001:2008Quality Management System Certification Synonyms: sodium hydrogen sulphide, sodium hydrogen sulfide, sodium sulfhydrate, sodium bisulphide, sodium hydrosulphide, sodium bisulfide Secification:ItemStandardContent, % ≥:7270Sodium sulphide,% ≤:23Sodium sulphite ... water or alcohol,its water solution is strongly alkaline,pure NaHS can be dissolved in Hcl and become clear solution and ...