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MAGNESI TRISILICAT-sualan1 - MAGNESI TRISILICAT Magnesii...

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MAGNESI TRISILICAT Magnesii trisilicas Magnesi trisilicat là magnesi silicat hydrat, có thành ph n thay đ i g n đúng v i công th c Mg 2 Si 3 O 8 . xH 2 O, ph i ch a không d i 29,0% magnesi oxyd [MgO; P.t.l: 40,30] và không d i 65,0% silicon ướ ướ dioxyd [SiO 2 ; P.t.l: 60,1], c hai đ u tính theo ch ph m đã nung. ế Tính ch t B t tr ng. Th c t không tan trong n c và ethanol 96%. ế ướ Đ nh tính Dung d ch S : Thêm vào 2,0 g ch ph m m t h n h p g m ế 4 ml acid nitric (TT) và 4 ml n c ướ , r i đun sôi, v a đun v a l c liên t c. Thêm 12 ml n c ướ , đ ngu i, l c ho c ly tâm đ l y dung d ch trong và ể ấ pha loãng d ch l c này thành 20 ml v i n c ướ . A. 1 ml dung d ch S, sau khi trung hòa v i dung d ch natri hydroxyd 2 M (TT) , ph i cho ph n ng đ nh tính c a magnesi (Ph l c 8.1). ụ ụ B. Cân 0,25 g ch ph m vào m t chén chì ho c b ch kim. Thêm vào chén 10 mg ế natri fluorid (TT) 0,2 ml acid sulfuric (TT) . Dùng dây đ ng đ tr n đ u h n h p trên và dàn thành l p m ng. Đ y chén b ng m t đĩa plastic m ng trong su t đã đ c nh m t gi t n c m t d i và làm nóng nh nhàng, ượ ướ ướ c n th n. M t vòng tròn màu tr ng s nhanh chóng xu t hi n xung quanh gi t n c. ướ
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