Sodium phosphate monobasic, with the CAS number 7558 - 80 - 7, is an inorganic compound. It is also known as monosodium phosphate. The chemical formula is NaH₂PO₄. It exists in different forms, including the anhydrous form and the monohydrate form (NaH₂PO₄·H₂O). The anhydrous form appears as a white, crystalline powder. The monohydrate form is also white and has a slightly different physical property due to the presence of water of crystallization.
Its molar mass is approximately 119.98 g/mol for the anhydrous form and 137.99 g/mol for the monohydrate form. The density of the anhydrous sodium phosphate monobasic is about 2.04 g/cm³. It is soluble in water, and its aqueous solution is acidic, with a pH in the range of around 4.1 - 4.7 depending on the concentration.
In the food industry, sodium phosphate monobasic is widely used as a food additive. It can act as a pH regulator, helping to control the acidity or alkalinity of food products. For example, in dairy products such as cheese, it can prevent the curdling process and maintain the stability of the product. It is also used in baking powder, where it reacts with baking soda to produce carbon dioxide gas, which helps the dough to rise during baking.
In the pharmaceutical field, it is used in the formulation of some medications. It can be used as a buffer to maintain the pH of solutions, ensuring the stability and effectiveness of the active ingredients. In addition, it can be used in some oral rehydration solutions to adjust the electrolyte balance in the body.
In the industrial sector, sodium phosphate monobasic is used in water treatment. It can react with calcium and magnesium ions in water to form insoluble precipitates, thereby reducing water hardness. It is also used in the production of detergents, where it can enhance the cleaning power by softening the water and preventing the formation of soap scum.
When using sodium phosphate monobasic in the food industry, it should be added in accordance with the relevant food safety standards. First, determine the appropriate amount based on the specific food product and the desired effect. The product can be directly dissolved in water or other liquid ingredients before being added to the food mixture. During the mixing process, ensure thorough stirring to ensure uniform distribution of the additive.
In pharmaceutical applications, strict quality control and compliance with relevant pharmaceutical regulations are required. It is usually dissolved in a suitable solvent to form a solution, and then mixed with other active ingredients according to the formulation requirements. The concentration and pH of the solution need to be carefully adjusted to ensure the stability and effectiveness of the medication.
In industrial water treatment, the dosage of sodium phosphate monobasic depends on the hardness of the water. Generally, a certain amount of the product is added to the water system, and then the water is stirred to promote the reaction. The dosage needs to be adjusted according to the test results of water quality to ensure optimal treatment effects.
Case 1: Baking Industry
A small - scale bakery was experiencing problems with inconsistent dough rising. After adding sodium phosphate monobasic to their baking powder formulation at the recommended ratio of 2% (by weight), they noticed a significant improvement. The dough rose more evenly, and the final baked products had a better texture and volume. The bakery was able to improve the quality of their bread and pastries, which led to increased customer satisfaction and higher sales.
Case 2: Water Treatment in a Small Manufacturing Plant
A manufacturing plant was facing issues with hard water, which was causing scaling in their pipes and reducing the efficiency of their equipment. They started using sodium phosphate monobasic in their water treatment system. By adding 5 ppm of sodium phosphate monobasic to the incoming water, they were able to reduce the water hardness by about 30%. This led to a decrease in equipment maintenance costs and an increase in the lifespan of their machinery.
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