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Heavy water is less dissociated than light water at given temperature, and the true concentration of D + ions is less than H + ions would be for light water at the same temperature. The same is true of OD − vs. OH − ions. For heavy water Kw D 2 O (25.0 °C) = 1.35 × 10 −15, and [D + ] must equal [OD − ] for neutral water
Water portal; Tritiated water is a radioactive form of water in which the usual protium atoms are replaced with tritium atoms. In its pure form it may be called tritium oxide (T 2 O or 3 H 2 O) or super-heavy water. Pure T 2 O is a colorless liquid, [1] and it is corrosive due to self-radiolysis. Diluted, tritiated water is mainly H 2 O plus ...
By comparison, heavy water D 2 O or 2 H 2 O [4] occurs at a proportion of about 1 molecule in 41 million (i.e., 1 in 6,400 2). This makes semiheavy water far more common than "normal" heavy water. The freezing point of semiheavy water is close to the freezing point of heavy water at 3.8°C compared to the 3.82°C of heavy water.
In practice, for both practical and safety reasons, almost all recent applications of the "doubly labeled water" (DLW) method use water labeled with heavy but non-radioactive forms of each element (deuterium, 2 H; and oxygen-18, 18 O). In theory, radioactive heavy isotopes of the elements could be used for such labeling; this was the case in ...
A pressurized heavy-water reactor (PHWR) is a nuclear reactor that uses heavy water (deuterium oxide D 2 O) as its coolant and neutron moderator. [1] PHWRs frequently use natural uranium as fuel, but sometimes also use very low enriched uranium .
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The hydrogen in normal water is about 99.97% 1 H (by weight). [2] Production of heavy water involves isolating and removing deuterium-containing isotopologues within natural water. The by-product of this process is DDW. [3] Due to the heterogeneity of hydrological conditions, the isotopic composition of natural water varies around the Earth.
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