Potassium Alum, with the CAS number 7784 - 24 - 9, is a double sulfate of potassium and aluminum with the chemical formula KAl(SO₄)₂·12H₂O. It appears as a colorless, transparent crystal or a white, crystalline powder. This high - quality product offers purity and is available at the best price in the market.
It has a molar mass of approximately 474.388 g/mol. The density of Potassium Alum is about 1.757 g/cm³, and it has a melting point of 92.5 °C. It is soluble in water, and its solubility increases with temperature. In an aqueous solution, it hydrolyzes to form a gelatinous precipitate of aluminum hydroxide.
1. **Water Treatment**: Potassium Alum is widely used in water purification processes. It acts as a flocculant, causing suspended particles in water to clump together and settle, making it easier to filter and remove impurities. This is crucial for providing clean and safe drinking water.
2. **Tanning Industry**: In the leather - tanning process, Potassium Alum is used to tan hides and skins. It helps in preserving the leather, increasing its durability, and preventing decay.
3. **Cosmetics and Personal Care**: It is a common ingredient in after - shave products. Its astringent properties help to close pores, reduce inflammation, and prevent infections. It is also used in some deodorants due to its antibacterial effects.
4. **Food Industry**: In some countries, Potassium Alum is used as a food additive. It is used in pickling to maintain the firmness of vegetables and in baking powder as a leavening agent.
1. **Water Treatment**: For water purification, dissolve the appropriate amount of Potassium Alum in water. The dosage depends on the turbidity of the water. Usually, a small amount (a few milligrams per liter) is added to the water and mixed thoroughly. Allow the water to stand for some time to let the flocs settle, and then filter the water.
2. **Tanning**: In the tanning process, a solution of Potassium Alum is prepared by dissolving it in water. The hides or skins are soaked in this solution for a specific period, which can range from a few hours to several days, depending on the thickness and type of the material.
3. **Cosmetics**: In after - shave products, Potassium Alum is often in the form of a block. After shaving, wet the alum block and gently rub it over the shaved area. The astringent effect will be felt immediately.
4. **Food Industry**: When using Potassium Alum as a food additive, follow the recommended dosage in the recipe. It should be dissolved in a small amount of liquid before adding it to the food mixture.
1. **Small - Scale Water Purification**: A rural community in a developing country was facing issues with turbid water. By using Potassium Alum, they were able to purify the water at a low cost. They added 5 mg of Potassium Alum per liter of water, mixed it well, and after 30 minutes of settling, the water became clear. This simple method provided them with clean drinking water.
2. **Leather Tanning in a Local Workshop**: A small - scale leather workshop started using Potassium Alum in their tanning process. They soaked the hides in a 5% Potassium Alum solution for 48 hours. The resulting leather was more durable and had a better texture compared to their previous methods. The workshop was able to increase the quality of their products and attract more customers.
3. **Cosmetic Use in a Beauty Salon**: A beauty salon introduced alum blocks as an after - shave product. Customers reported less irritation and redness after shaving. The astringent properties of Potassium Alum helped to soothe the skin and prevent ingrown hairs, leading to an increase in customer satisfaction.
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