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Feb 28, 2017 · This monograph for Sodium Thiosulfate Pentahydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, pH ...
Pour cca5 g of sodium thiosulphate pentahydrate into a test tube. Melt it by mild heating in a burner flame. After some time, thiosulphate fully dehydrates. Then continue heating in the strong flame. Thiosulphate decomposes, and a thin coating of yellow sulphur appears in the test tube. 4 Na. 2. S.
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Sodium thiosulfate ( sodium thiosulphate) is an inorganic compound with the formula Na2S2O3· (H2O) (x). Typically it is available as the white or colorless pentahydrate (x = 5). It is a white solid that dissolves well in water. The compound is a reducing agent and a ligand, and these properties underpin its applications.
This monograph for Sodium Thiosulfate Pentahydrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, pH ...
- 1 Introduction
- 2 Experimental
- 3 Results and Discussion
- Acknowledgements
Inorganic hydrated salt have large latent heat and high thermal conductivity compared with organic PCM.18 However, the application of inorganic hydrated salt is limited due to its decomposition, phase segregation and supercooling.19 In order to overcome the problems of inorganic hydrated salt, MicroPCM have received great attention for thermal ener...
2.3 Characterization of the MicroPCM
The XRD patterns of SoTP, silica and MicroPCM were carried out by X-ray diffraction instrument (Dandong Haoyuan Instrument Co., Ltd, DX-2700). The testing voltage was 40 kV and test current was 30 mA. The scanning mode was step-scan, and its step size was 0.03 and the integral time was 0.2 s. The EDX and XPS of MicroPCM were tested by scanning electron microscope (SEM, ZEISS evo18) and X-ray photoelectron spectroscopy (XPS, ESCALAB 250Xi), respectively. The morphology of MicroPCM was observed...
3.1 Chemical characterization of MicroPCM
The phase analysis of silica, SoTP and MicroCM was observed by XRD and the results are shown in Fig. 2. No diffraction peak is observed for silica, which indicated that silica is amorphous. The XRD pattern of SoTP displays diffraction peaks at 16.6°, 21.3° and 26°, indicating that its high-crystalline structure. The XRD pattern of MicroPCM exhibits some diffraction peaks, which is assigned to crystalline SoTP. However, some new diffraction peaks appeared in the XRD patterns of MicroPCM. This...
3.2 Morphology of the MicroPCM
The morphology of MicroPCM with different concentration of emulsifier is shown in Fig. 6. It can be seen that the MicroPCM of S1, S2, S3 and S4 have relatively compact and smooth surface with spherical shape. The S5 MicroPCM presents some irregular particles. In addition, the particle size distribution of S3 is more uniform than that of S1, S2, S4 and S5. The particles of MicroPCM are agglomerate together easily with higher emulsifier content. This indicates that the content of emulsifier has...
3.3 Thermal properties of the MicroPCM
The solidified DSC curves of SoTP and MicroPCM with different core/shell mass ratio are shown in Fig. 10. As can be seen, the SoTP and MicroPCM have serious supercooling phenomenon observed. Especially, the SoTP has no exothermic peak in the cooling process. This indicates that the SoTP is no crystal in the cooling process because H2O evaporate from SoTP during the heating process. However, the MicroPCM have an exothermic peak in the cooling process. The solidified temperature of S6, S7, S3,...
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- 2017
Sodium thiosulfate (sodium thiosulphate) is a chemical and medication. The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water. It is also called sodium hyposulfite or “hypo”. Sodium thiosulfate is called hypo as an abbreviated form of one of its historically more common names, hyposulfite of soda.
The crystal structure of the dihydrate of Na 2 S 2 O 3 has been determined for the first time. Although this phase has been mentioned in the respective literature for many decades and some sophisticated experiments to synthesize pure samples, usually via controlled dehydration of the pentahydrate, are described, no structural information besides a set of monoclinic lattice parameters is ...
