From Al₂(SO₄)₃ molecular weight to its daily life applications

Molecular weight generally refers to relative molecular mass. Relative molecular mass refers to the sum of the relative atomic mass (Ar) of each atom in a chemical formula, represented by the symbol Mr. What is Al₂(SO₄)₃ molecular weight? Al₂(SO₄)₃ molecular weight is 342.15.

Al₂(SO₄)₃ molecular weight is very important for its chemical properties because it directly affects the solubility, reactivity and interaction with other substances of the compound. Aluminum sulfate is an inorganic compound with the Al₂(SO₄)₃ structure, a molar mass of 342g/mol. It is a white orthorhombic crystalline powder. It is soluble in water and insoluble in ethanol, and the solution is acidic. It loses some of its crystal water at 86.5℃ and all of it at 250℃. When heated, it expands violently and becomes a sponge-like substance. When burned to red heat, it decomposes into sulfur trioxide and aluminum oxide. Its melting point is 770℃ and its density is 2.71g/cm³.

Water Treatment

Ever wonder how we get safe drinking water flowing out of our taps? Aluminum sulfate is a big help. Municipal water suppliers, such as your local water company, use aluminum sulfate to treat water for human consumption. In addition, this chemical can be used to purify process water when bacteria/sediment would cause adverse effects.

When aluminum sulfate is added to water, it causes tiny impurities to clump into larger and larger particles. These clumps then settle to the bottom of the container and can be filtered out. This makes drinking water safer. Based on the same principle, aluminum sulfate is sometimes used in swimming pools to reduce the turbidity of the water.

Dyeing

Take a look at your clothes, sheets, curtains, they may have been dyed with aluminum sulfate. One of the many uses of aluminum sulfate is for fabric dyeing and printing. When dissolved in large amounts of water with a neutral or slightly alkaline pH, the compound produces a sticky substance called aluminum hydroxide. This stickiness makes the dye insoluble in water, thereby helping the dye adhere to the fabric fibers. Thus, aluminum sulfate acts as a dye fixative, meaning it bonds to the molecular structure of the dye and fabric so the dye does not run when the fabric becomes wet.

Papermaking

Aluminum sulfate was used in the past to make paper, although synthetic agents have largely replaced it. Aluminum sulfate helps to size the paper. In this process, it combines with rosin soaps to change the absorbency of the paper, which changes the paper's ability to absorb ink. Aluminum sulfate creates an acidic environment, while synthetic sizing agents create acid-free paper that does not break down easily.

Food

Aluminum sulfate has a variety of uses in the foods we eat, and is generally considered safe when used in accordance with good manufacturing practices. It is soluble in water, so it is primarily used as a thickener and emulsifier. It is also used to remineralize soft drinks and beer and purify water; control the pH of beets, tomatoes, and other vegetables; purification of beet juice; control pH and color wine and liquor; use as a leavening agent (baking soda) in cake mixes; make cheese curdle and thicken.

Gardening

Because aluminum sulfate is so acidic, it is sometimes added to very alkaline soils to balance the pH of plants. When aluminum sulfate comes into contact with water, it forms aluminum hydroxide and a much more diluted sulfuric acid solution, which changes the acidity of the soil. Hydrangea gardeners use this property to change the color of hydrangeas (blue or pink) because the plant is very sensitive to soil pH.

In summary, we know that the molecular weight of Al₂(SO₄)₃ is very important for its chemical properties and allows it to be used in a variety of applications such as water treatment, printing and dyeing, papermaking, food, gardening, etc.