The synthesis and decomposition of calcium tetraphosphate.

概要

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Calcium tetraphosphate was made by hydrolyzing cyclotetraphosphate in a 5-mol dm−3-solution of sodium hydroxide, neutralizing the phosphate solution with 1 mol dm−3 hydrochloric acid, and then adding calcium chloride to the solution. The P/Ca molar ratio of the product was 1.4–1.5. The tetraphosphate was an amorphous substance containing 20–30% of water and was decomposed to phosphates with a shorter chain length with bound water at room temperature or at a higher temperature. Upon decomposition at 300 °C, the main product at the early stage was pyrophosphate. The hydrolysis of the tetraphosphate obeyed the first-order kinetics with respect to the concentration of the phosphate, and the activation energy of the hydrolysis was 105 kJ mol−1 at pH 3.5.
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