A research group from Ruhr-Universität Bochum has investigated how acids interact with water molecules at extremely low temperatures. Using spectroscopic analyses and computer simulations, they investigated the question of whether hydrochloric acid (HCl) does or does not release its proton in conditions like those found in interstellar space. The answer depends on the order in which the water and hydrochloric acid molecules come together.
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Source: Phys.org