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Two crystalline forms are known, both being very similar to the corresponding potassium sulfate. Orthorhombic β-K 2 CrO 4 is the common form, but it converts to an α-form above 66 °C. [1] These structures are complex, although the chromate ion adopts the typical tetrahedral geometry. [2]
This occurs as the solubility of silver chromate is very low (K sp = 1.12×10 −12 or 6.5×10 −5 mol/L). [ 2 ] The formation of insoluble Ag 2 CrO 4 nanostructures via the above reaction with good control over particle size and shape has been achieved through sonochemistry , template-assisted synthesis or hydrothermal methods.
Electron configuration is also a major factor, illustrated by the fact that the rates of water exchange for [Al(H 2 O) 6] 3+ and [Ir(H 2 O) 6] 3+ differ by a factor of 10 9 also. [4] Water exchange usually follows a dissociative substitution pathway, so the rate constants indicate first order reactions.
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Iowa State (10-3), which doesn't have any reported opt-outs, won 10 games for the first time in school history, reaching the Big 12 Championship, where it lost to Arizona State 45-19.