Ethylenediaminetetraacetic acid (EDTA - ACID) with the CAS number 60 - 00 - 4 is a well - known and widely used chelating agent. It is a white, crystalline powder at room temperature. The molecular formula of EDTA - ACID is C10H16N2O8, and its molecular weight is approximately 292.24 g/mol. It has a high purity level, ensuring its effectiveness in various applications. The acid dissociation constants (pKa values) of EDTA are 2.0, 2.7, 6.2, and 10.3, which play crucial roles in its chelating properties. EDTA - ACID is slightly soluble in water at room temperature but can dissolve better in alkaline solutions.
1. **Industrial Applications**: In the textile industry, EDTA - ACID is used to remove metal ions from dyeing baths. Metal ions can cause color variations and precipitation in dyes, and by chelating these metal ions, EDTA - ACID helps to achieve more consistent and high - quality dyeing results. In the pulp and paper industry, it is used to prevent the darkening of paper caused by metal ions, especially iron ions.
2. **Food Industry**: It is used as a food additive (E386). EDTA - ACID can prevent the oxidation and discoloration of food products by chelating metal ions that catalyze these reactions. For example, it is added to canned fruits and vegetables to maintain their color and flavor.
3. **Pharmaceutical Industry**: In pharmaceuticals, EDTA - ACID is used as a stabilizer in some medications. It can chelate metal ions that may degrade the active ingredients of drugs, thus extending the shelf - life of the products.
4. **Analytical Chemistry**: EDTA - ACID is a common reagent in complexometric titrations. It can form stable complexes with metal ions such as calcium, magnesium, and zinc, which allows for the accurate determination of the concentration of these metal ions in solutions.
1. **Preparation of Solutions**: When using EDTA - ACID, it is often necessary to prepare a solution. First, weigh the appropriate amount of EDTA - ACID according to the required concentration. Then, add it to a suitable solvent, usually water. Stir the mixture and adjust the pH if necessary. For example, to prepare a 0.1 M EDTA solution, weigh 29.22 g of EDTA - ACID and dissolve it in about 800 mL of water. Then, adjust the pH to around 8.0 with sodium hydroxide solution and make up the volume to 1 L.
2. **Dosage in Different Applications**: In the textile industry, the dosage of EDTA - ACID in the dyeing bath depends on the type and amount of metal ions present. Generally, a concentration of 0.5 - 2 g/L is used. In the food industry, the maximum permitted level of EDTA - ACID as a food additive is regulated by relevant authorities. For example, in the United States, the limit in certain canned foods is 0.25%.
1. **Textile Dyeing Case**: A textile factory was experiencing inconsistent color shades in its dyeing process. After analyzing the dyeing bath, it was found that there were high levels of iron and copper ions. The factory decided to add EDTA - ACID to the dyeing bath at a concentration of 1 g/L. After the addition, the color variations significantly reduced, and the quality of the dyed textiles improved. The factory was able to produce more consistent products, which increased customer satisfaction and reduced waste.
2. **Food Preservation Case**: A food processing company that produces canned tomatoes was facing the problem of browning and oxidation of the tomatoes during storage. They added EDTA - ACID at a concentration of 0.1% to the canned tomatoes. After several months of storage, the canned tomatoes maintained their original color and flavor much better compared to the non - treated samples. This not only improved the product quality but also extended the shelf - life of the canned tomatoes.
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