Mobilities of gaseous ions in CH3NO2H2 and CH3CNH2 mixtures

Extending previous investigations by Loeb of mobilities in gaseous mixtures using his procedure except that the auxiliary field in these measurements was made equal to the advancing field thus giving absolute values of the mobilities, measurements of mobilities were made in mixtures of CH₃NO₂H2 and CH₃CNH₂. The mobilities in H₂ were 7.12 for the positive ions and 10.46 for the negative ions in cm./sec. per volt/cm. Those in CH₃NO₂ were 0.221 cm./sec. per volt/cm. for both ions and in CH₃CN they were 0.234 cm./sec. per volt/cm. for both ions. Both ion mobilities deviated from Blanc's law in CH₃NO₂ indicating the formation of complexes with the CH₃NO₂ ions somewhat greater in size than the normal ions in H₂. The molecules attached to negative ions somewhat less readily than to the positive ions but both final ions were of the same size. In CH₃CN mixtures both positive and negative ions deviated from Blanc's law, the positive ion showing more ready attachment of CH₃CN. The negative ion had consistently a higher mobility than the positive ion, a circumstance indicating a smaller ion and suggesting that the attaching molecule might not be CH₃CN but some impurity. Both ion addition products in CH₃CN are larger than the normal ion in H₂ but smaller than those in CH₃NO₂ as was to be expected.