Recherches sur le point isohydrique et les kquilibres acido-basiques de condensation ou association en chimie. XXVII. Les pkCz + pkZ2* = 4.00 + 0.10 pk23 = 3.60 + 0.10 Par ailleurs, le "sel isohydrique" (de taux xi = 0.5) ~IICOIIIIU jusqu'a prCsent a pu Ctre effectivement isolC: (CH 3)6Sn2(0H)C1.The electrometric study of the trimethyltin chloride and diethyltin dichloride, at 25 "C, and at different ionic strengths, leads to ph = f(x,c) networks, each of which shows an isohydric point (i.p.), proof of the existence in solution of an associated preponderant form in equilibrium with the monomeric. The theoretical study permitted us to determine the different equilibrium constants. The values of the experimental isohydric coordinates and of the calculated constants, for each of the previous networks, are : (1) (CH,) 3S~iC1-KOH System Furthermore, the "isohydric salt" ((CH3)6Sn2(OH)Cl), corresponding to xi = 0.50 but not known until now, was obtained.

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