Perchloric acid

CONTENTS
I. Introduction 269
II. Brief historical outline 269
III. Forms of perchloric acid 270
IV. Properties of perchloric acid hydrates 271
V. Molecular structure of perchloric acid hydrates 272
VI. Volatility of perchloric acid 273
VII. Perchloric acid as an electrolyte 273
VIII. Perchloric acid in the formation of acidium salts 274
IX. Chlorine heptoxide 275
X. Molecular structure of perchloric acid and of chlorine heptoxide 276
XI. Melting-point diagram of the Cl₂O₇–H₂O system 277
XII. Density of the Cl₂O₇–HClO₄ systems 278
XIII. Viscosity of the Cl₂O₇–HClO₄ systems 278
XIV. Integral heats of solution in the Cl₂O₇–HClO₄ system 279
XV. Thermal stability of perchloric acid 279