Disodium hydrogen phosphate dihydrate (Na2HPO4·2H2O) has several major and common uses across various industries. Here are some of the most notable applications:

1. Food Industry: Disodium hydrogen phosphate dihydrate is used as a food additive in processed foods and beverages. It acts as a buffering agent and emulsifier, helping to stabilize and maintain the pH of food products. It is also used as a nutrient supplement in certain food formulations.
2. Pharmaceuticals: The compound is utilized in the pharmaceutical industry as a pH regulator and buffering agent in the formulation of medications. It helps adjust the acidity or alkalinity of solutions and ensures the stability of active pharmaceutical ingredients.
3. Water Treatment: Disodium hydrogen phosphate dihydrate is employed in water treatment processes, specifically as a builder or sequestering agent. It helps to control water hardness and prevent the formation of scale and deposits in boilers and cooling systems.
4. Laboratory Applications: Due to its ability to act as a pH buffer, disodium hydrogen phosphate dihydrate is commonly used in laboratory settings for various chemical and biological experiments. It helps maintain a stable pH environment, which is crucial for many analytical and research procedures.
5. Cleaning Products: The compound can be found in some cleaning agents, particularly those designed for industrial or commercial use. It aids in removing stubborn stains and serves as a pH adjuster in cleaning formulations.
6. Cosmetics and Personal Care Products: Disodium hydrogen phosphate dihydrate may be utilized in certain cosmetics and personal care products. It can function as a pH adjuster, stabilizer, or emulsifying agent, ensuring the stability and efficacy of these formulations.