The rare earth metal sulfate hydrate, and its manufacturing method, and a chemical heat accumulati

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An object of the present invention is to provide an inexpensive and highly safe compound useful as a chemical heat storage material that ensures high reproducibility even in repeated reactions (having high repetition durability), and is capable of reversibly advancing heat storage and heat dissipation even in a relatively low temperature range. The present invention is a hydrate of a rare earth metal sulfate having characteristic peaks at specific diffraction angles (2θ) in an X-ray diffraction pattern, which is measured using a copper radioactive ray of λ=1.5418 Å passed through a monochromator.