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Sat sulfat kho - ST(II SULFAT KH Ferrosi sulfas siccum...

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S T (II) SULFAT KHÔ Ferrosi sulfas siccum S t (II) sulfat khô là s t (II) sulfat đã b lo i m t ph n n c k t tinh do s y ướ ế 40 o C, ph i ch a t 86,0 đ n 90,0% FeSO ế 4 . Tính ch t B t tr ng xám. Hoà tan ch m nh ng g n nh hoàn toàn trong n c m i đun sôi đ ngu i. ư ư ướ Đ nh tính Ch ph m cho ph n ng c a ion s t (II) và ion sulfat (Ph l c 8.1). ế ụ ụ Arsen Không đ c quá 3 ph n tri u (Ph l c 9.4.2). ượ ụ ụ Hoà tan 1,0 g ch ph m trong 10 ml ế n c ướ và 15 ml acid hydrocloric đã thi c hoá ế (TT) . C t l y 20 ml d ch c t, thêm 0,15 ml n c brom (TT) ướ . Đu i brom th a b ng 0,15 ml dung d ch thi c (II) clorid AsT (TT) ế và pha loãng v i n c ướ thành 75 ml. L y 25 ml dung d ch thu đ c đ th theo ph ng pháp A. ượ ươ Đ ng Không đ c quá 50 ph n tri u. ượ Xác đ nh b ng ph ng pháp quang ph h
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