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KALI PERMANGANAT - KALI PERMANGANAT Kalii permanganas KMnO4...

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KALI PERMANGANAT Kalii permanganas KMnO 4 P.t.l: 158,03 Kali permanganat phaûi chöùa töø 99,0 ñeán 100,5% KMnO 4 . Tính chaát Tinh theå hình laêng truï maøu tím saãm hoaëc gaàn nhö ñen, hoaëc boät daïng haït, maøu tím saãm hoaëc ñen naâu, thöôøng coù aùnh kim, khoâng muøi. Deã bò phaân huûy vaø gaây noå khi tieáp xuùc vôùi moät soá chaát höõu cô vaø chaát deã bò oxy hoùa. Tan trong nöôùc laïnh, deã tan trong nöôùc soâi. Caàn thaän troïng khi tieán haønh thöû nghieäm vôùi kali permanganat vì khi tieáp xuùc tröïc tieáp chaát naøy vôùi moät soá chaát höõu cô hoaëc chaát deã bò oxy hoùa khaùc noù coù theå gaây noå ngay caû ôû traïng thaùi loûng hoaëc raén. Ñònh tính A. Hoøa tan khoaûng 50 mg cheá phaåm trong 5 ml nöôùc, theâm 1 ml ethanol 96% vaø 0,3 ml dung dòch natri hydroxyd loaõng (TT). Dung dòch xuaát hieän maøu xanh. Ñun dung dòch ñeán soâi, tuûa naâu xaùm xuaát hieän.
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