Mercury , crystal

Fig. 5 shows data from a simulation of TIP4P water that is confined on both sides by a rhombohedral mercury crystal with (111) surface structure. Bosio et al. [135] deduce from their X-ray studies that a solid o-mercury lattice with a larger lattice constant in the z direction may be used as a good structural model for liquid mercury. Thus, the mercury phase was modeled as a rigid crystal in order to simplify the simulations. The surface of such a crystal shows rather low corrugation. 

Fig. 4. Snapshot from a simulation at room temperature of 259 water molecules, one 1 ion and 4 non-mobile layers of a face-centered cubic mercury crystal with (111) surface structure. Only the basic cell is shown periodic boundary conditions are applied in the x and y directions only.

Fig. 9. Oxygen (top) and hydrogen (bottom) density profiles of water near a rigid mercury crystal (full line) and near liquid mercury (short dashes). The long-dashed curves are the convolution of the density profiles near the rigid crystal and the first maximum in the liquid mercury density profile according to Eq. (11) and 12. The dashed curves are shifted downward by one or two units for better legibility.

Biscarini P, Fusina L, Nivellini G, Pelizzi G (1977) Three-co-ordinate mercury Crystal stmcture and spectroscopic properties of trimethylsrrlphonirrm trichloromereurate (II). J Chem Soc, Dalton Trans 663-668... 

Mercury-crystal structure visualisation, exploration and analysis made easy. http //www. ccdc.cam.ac.uk/products/mercury/... 

Mercurous Nitrate. Mercurous nitrate [10415-75-5] Hg2N20 or Hg2(N02)2, is a white monoclinic crystalline compound that is not very soluble in water but hydrolyzes to form a basic, yellow hydrate. This material is, however, soluble in cold, dilute nitric acid, and a solution is used as starting material for other water-insoluble mercurous salts. Mercurous nitrate is difficult to obtain in the pure state directly because some mercuric nitrate formation is almost unavoidable. When mercury is dissolved in hot dilute nitric acid, technical mercurous nitrate crystallizes on cooling. The use of excess mercury is helpful in reducing mercuric content, but an additional separation step is necessary. More concentrated nitric acid solutions should be avoided because these oxidize the mercurous to mercuric salt. Reagent-grade material is obtained by recrystaUization from dilute nitric acid in the presence of excess mercury. 

Mercuric Nitrate. Mercuric nitrate [10045-94-0] Hg(N02)2, is a colorless dehquescent crystalline compound prepared by the exothermic dissolution of mercury in hot, concentrated nitric acid. The reaction is complete when a cloud of mercurous chloride is not formed when the solution is treated with sodium chloride solution. The product crystallizes upon cooling. Mercuric nitrate is used in organic synthesis as the starting material and for the formulation of a great many other mercuric products. 

Dissolution of Silver. Silver is dissolved by oxidising acids and alkaU metal cyanide solutions in the presence of oxygen. The latter method is the principal technique for dissolving silver from ore. Silver has extensive solubiUty in mercury (qv) and low melting metals such as sodium, potassium, and their mixtures. Cyanide solutions of silver are used for electroplating and electroforming. The silver is deposited at the cathode either as pure crystals or as layers on a mandrel. 

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