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A continuous-dilution dilatometer, of the tilting type, specifically designed for study of the apparent molar volumes of aqueous electrolytes at low concentrations, is described. Results at 298.16 K have been secured for multivalent (� 3, � 4, � 6) univalent electrolytes which demonstrate that the apparent molar volumes vary with c� in approximate conformity with the Debye-Huckel limiting-law slopes. Data are presented for: [Co(en)3] Cl3, K3 [CO(CN)6], [Pt(en)3] Cl4, K4 [Mo(CN)8], [C0{(0H)2Co(en)2}3] (NO3)6,Na6C6(C00)6, K4 [Fe(CN)6] and [Co(en)3] (C1O4)3 Ion pairing is a significant disturbing factor which hinders treatment of the data in terms of extended forms of the Debye-Huckel equation.

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The crystal structure of the title compound, [C9H8NO]2[FeCl4]C1, has been determined by single-crystal X-ray diffraction methods at 295 K and refined by least squares to a residual of 0.043 for 2415 independent 'observed' reflections. Crystals are triclinic, P1, a 14.243(5), b 10.177(3), c 7.583(3) �, α 84.71(3), β 86.96(3), γ 86.50(3�, Z 2. The organic moiety is protonated at the nitrogen atom, with the discrete chloride ions hydrogen-bonded in lattice tunnels; this offers a rationale for the finite but small hydrogen chloride partial pressure at room temperature.