Abstract
The equilibria pH + + qMoO 4 2− + r(CH 3) 2AsO 2 − ⇆ (H +) p (MoO 4 2− q ((CH 3) 2AsO 2 −) r have been investigated at 25.0°C in 0.600 M Na(Cl) by the combined emf-NMR method. Both emf and 1H NMR data confirmed the existence of [(CH 3) 2AsMo 4O 14(OH)] 2−, (7,4,1) in the ( p, q, r) notation, in solution. Least-squares calculation gave log β 7,4,1 = 46.20 ± 0.03, where β 7,4,1 is the formation constant of (7,4,1). No other ternary species was detected in solution.
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