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Stibnite, sometimes called antimonite, is a sulfide mineral with the formula Sb 2 S 3.This soft grey material crystallizes in an orthorhombic space group. [6] It is the most important source for the metalloid antimony. [7]
2 Sb + 3 S → Sb 2 S 3. Sb 2 S 3 is precipitated when H 2 S is passed through an acidified solution of Sb(III). [9] This reaction has been used as a gravimetric method for determining antimony, bubbling H 2 S through a solution of Sb(III) compound in hot HCl deposits an orange form of Sb 2 S 3 which turns black under the reaction conditions. [10]
3 is prepared by the reaction of Sb 2 O 3 with HF: [32] Sb 2 O 3 + 6 HF → 2 SbF 3 + 3 H 2 O. It is Lewis acidic and readily accepts fluoride ions to form the complex anions SbF − 4 and SbF 2− 5. Molten SbF 3 is a weak electrical conductor. The trichloride SbCl 3 is prepared by dissolving Sb 2 S 3 in hydrochloric acid: [33] Sb 2 S 3 + 6 ...
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Antimony trisulfide, Sb 2 S 3; Antimony pentasulfide, Sb 2 S 5, known as antimony red This page was last edited on 1 February ...
The Sb–O distance is 197.7 pm and the O–Sb–O angle of 95.6°. [12] This form exists in nature as the mineral senarmontite. [11] Above 606 °C, the more stable form is orthorhombic, consisting of pairs of -Sb-O-Sb-O- chains that are linked by oxide bridges between the Sb centers. This form exists in nature as the mineral valentinite. [11]
Antimony tetroxide is an inorganic compound with the formula Sb 2 O 4.This material, which exists as the mineral cervantite, [3] is white but reversibly yellows upon heating. The material, with empirical formula SbO 2, is called antimony tetroxide to signify the presence of two kinds of Sb centers.
Under SB 2, a first session, called a "Deliberative Session", is held about a month prior to the town election. This session is similar in many ways to the traditional town meeting. However, unlike the town meeting, while the wording and dollar amounts of proposed ballot measures may be amended, no actual voting on the merits of the proposals ...