Silent Discharge Reactions in Aqueous Solutions. VI. Aqueous Solution of Chloralhydrate in Atmospheres of Helium and Argon

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Abstract
Although most of the reaction systems hitherto treated are limited to acidic solutions in the series of this present research, this work has been extended to neutral solutions. Silent discharge leads to production of hydrochloric acid from neutral aqueous chloralhydrate. A linear correlation was observed between yield of hydrochloric acid and electric discharge current. This finding has been successfully interpreted in terms of absorbed dose, the value of which can be estimated at a given electric discharge current. Yields of hydrochloric acid were not significantly affected by chloralhydrate concentration between 1×10−2 m and 1×10−3 m. The experiments of the radical scavenging effect of cupric ion and bromide ion showed that KH+Cu2+⁄KH+CCl3CH(OH)2≈0.2 and KOH+Br−⁄KOH+CCl3CH(OH)2≈9, and also that the following formula holds approximately irrespective of kind of gas used in low solute concentration and dose rate used in this work: values of hydrogen atom G(HCl)\simeq3G(OH)+G(H). Moreover, these findings also suggested that the G values of and hydroxyl radical obtained in the acidic aqueous solution can be applied approximately to the neutral region. The relation of G(HCl) to solute concentration was qualitatively identical to gamma-ray irradiation, although they are different in detail because of the difference in value of LET and in the mechanism of radical formation.