(Lab07)_Halides,_Sulfates,_and_Borates_F11

(Lab07)_Halides,_Sulfates,_and_Borates_F11 - Halides,...

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1 Halides, Sulfates, and Borates GLY 4200 Lab 7 - Fall, 2011
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2 Halides Minerals contain the anions F - , Cl - , Br - , or I - More than one hundred forty halides are known – few are important Bonding is usually nearly purely ionic Anion is spherical, so structures have high symmetry If the cation is small and highly polarizing, symmetry will be reduced (cryolite, Na 3 AlF 6 is monoclinic)
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3 Halide Properties Ionic bonding makes them highly soluble Usually found in evaporite deposits in arid regions Some are quite insoluble Isometric halides have low hardness and moderate to high melting points They are poor conductors of heat and electricity except near the melting point
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4 Taste Halite (NaCl) and sylvite (KCl) are similar in appearance One method of distinguishing them is taste Halite = salty Sylvite = bitter
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5 Sulfates There minerals are characterized by cations bonded to the SO 4 2- group This group is tetrahedral The sulfur-oxygen bonds are strong, and the
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(Lab07)_Halides,_Sulfates,_and_Borates_F11 - Halides,...

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