Magnesium sulfate heptahydrate (MgSO4 · 7H2O), wanda kuma aka sani da sulfur daci, gishiri mai ɗaci, gishiri na cathartic, gishiri Epsom, allura ce ta fari ko mara launi ko crystal columnar, mara wari, sanyi da ɗan ɗaci, nauyin kwayoyin: 246.47, takamaiman nauyi 1.68 , mai sauƙi mai narkewa a cikin ruwa, dan kadan mai narkewa a cikin ethanol da glycerol, a cikin 67.Chemicalbook5℃ narkar da shi a cikin ruwan crystal na kansa.Bazuwar zafi, 70, 80 ℃ shine asarar kwayoyin halitta guda hudu na ruwa na crystal.A 200 ℃, duk ruwan crystalline ya ɓace don samar da abu mai anhydrous.A cikin iska (bushe) mai sauƙin yanayi zuwa foda, dumama sannu a hankali cire kristal ruwa zuwa cikin magnesium sulfate mai anhydrous, wannan samfurin ba ya ƙunshe da wani ƙazanta mai guba.
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