Sodium Pyrosulfate, with the CAS number 13870-29-6, is a high - quality chemical compound. It has a molecular formula of Na₂S₂O₇. The compound appears as a white crystalline powder. Sodium Pyrosulfate is highly soluble in water, and upon dissolution, it reacts with water to form sulfuric acid and sodium hydrogen sulfate. It has a molar mass of approximately 222.11 g/mol. This compound is often used in various industrial and laboratory applications due to its strong acidic and dehydrating properties.
1. **Analytical Chemistry**: In analytical laboratories, Sodium Pyrosulfate is used as a flux. It can react with metal oxides and convert them into soluble sulfates, which makes it easier to analyze the metal content in samples. For example, it can be used to break down complex silicate minerals for elemental analysis.
2. **Ceramics Industry**: It is used as a glaze additive. Sodium Pyrosulfate can help adjust the viscosity and surface tension of the glaze, improving its adhesion and the overall appearance of the ceramic product.
3. **Textile Industry**: In some textile processing operations, it can be used as a bleaching agent. Its strong oxidizing properties can help remove colorants and impurities from the fabric, achieving a bleached effect.
When using Sodium Pyrosulfate, safety precautions must be strictly followed. Wear appropriate personal protective equipment, including gloves, goggles, and a lab coat.
1. **In the Laboratory**: When using it as a flux for sample decomposition, first, weigh the appropriate amount of Sodium Pyrosulfate according to the sample size. Then, mix it thoroughly with the sample in a crucible. Heat the crucible gradually to a high temperature (usually around 400 - 500 °C). After the reaction is complete, cool the crucible and dissolve the product in an appropriate acid solution for further analysis.
2. **In the Ceramics Industry**: Add the required amount of Sodium Pyrosulfate to the glaze mixture during the glaze preparation process. Stir the mixture well to ensure uniform dispersion. Then apply the glaze to the ceramic surface as usual.
3. **In the Textile Industry**: Prepare a solution of Sodium Pyrosulfate with the appropriate concentration. Immerse the fabric in the solution for a certain period, and then rinse it thoroughly with water to remove the remaining chemicals.
1. **Laboratory Analysis of Silicate Minerals**: A research team was trying to determine the elemental composition of a complex silicate mineral. They used Sodium Pyrosulfate as a flux. After weighing 0.5 g of the mineral sample and mixing it with 2 g of Sodium Pyrosulfate in a platinum crucible, they heated the crucible at 450 °C for 30 minutes. The resulting product was dissolved in hydrochloric acid, and then analyzed using inductively coupled plasma - mass spectrometry (ICP - MS). This method successfully allowed them to accurately determine the concentrations of various elements in the mineral sample, which was difficult to achieve using traditional methods.
2. **Ceramic Glaze Improvement**: A ceramics manufacturer was facing problems with the adhesion and appearance of their glaze. They added a small amount (about 3% by weight) of Sodium Pyrosulfate to their glaze formulation. After the improvement, the glaze adhered better to the ceramic surface, and the finished products had a smoother and more attractive appearance. The defect rate in the production process decreased significantly from 15% to 5%.
3. **Textile Bleaching**: A textile factory wanted to improve the bleaching effect of their cotton fabric. They prepared a 5% Sodium Pyrosulfate solution and immersed the fabric in it for 2 hours at a temperature of 50 °C. After rinsing, the fabric became much whiter and cleaner, meeting the high - quality requirements of their customers.
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