Raman spectra of perchloric acid in water have been measured for solutions spanning a wide concentration range and, for two specific concentrations, a wide range of temperatures. The acid is completely dissociated down to a water:acid mole ratio of about 1.8 at room temperature. At elevated temperatures it is still a very "strong" acid. As the concentration increases the apparent symmetry of the ClO 4 − ion decreases and a small amount of a new species assigned as associated ClO 4 − •(H aq ) + can be detected. The effects on the OH stretching bands of water, of temperature, ClO 4 − , and the excess acid protons are discussed.
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Ratcliffe et al. (1984) studied this question.