Hydration properties of Sodium Tripolyphosphate on sales
The chemical nature of the hydration properties of Sodium Tripolyphosphate on sales. Sodium Tripolyphosphate on sales can be divided into high-temperature type (Type I) and low-temperature type (Type II) due to different formation temperatures. The difference lies in the difference in bond length and bond angle.
Both Type I and Type II products of Sodium Tripolyphosphate on sales generate hexahydrate Na 5P 3O 10·6H 2O after hydration. Under the same conditions, Type I hydration produces high heat and is easy to form crystals when dissolved in water. This is due to the presence of sodium ions with four ligands in the type I structure, and the four ligands have a strong affinity for water, whereas type II forms hexahydrate at a very slow rate in water.
Sodium Tripolyphosphate on sales Sodium tripolyphosphate is quite stable at room temperature. It will slowly undergo a hydrolysis reaction in humid air, and finally, generate sodium orthophosphate. The reaction is as follows: Na 5P 3O 10+2H 2O→2Na 2HPO 4+NaH 2PO 4.
For the chelating ability of metal ions, Sodium Tripolyphosphate on sales has complexation with metal ions such as Ca 2+, Mg 2+, and Fe 3+ dissolved in water to form soluble complexes, such as Na 5P 3O 10+Ca 2+→Na3(CaP3O10)+2Na+. The complexing ability of sodium tripolyphosphate is generally expressed by the calcium value, that is, the number of grams of calcium ions that 100g of phosphate can complex, and the theoretical value is 13.4.
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