Disodium Hydrogen phosphate dihydrate

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Disodium hydrogen phosphate dihydrate, also known as disodium phosphate dihydrate or Na2HPO4·2H2O, is a chemical compound with the formula Na2HPO4·2H2O. It is a crystalline solid that consists of two sodium cations (Na+) and one dihydrogen phosphate anion (HPO42-) combined with two water molecules (H2O).

Disodium hydrogen phosphate dihydrate is commonly used as a food additive, buffering agent, emulsifier, and pH regulator in various industries. It has a wide range of applications, including in the production of beverages, processed foods, and pharmaceuticals. Additionally, it is utilized in laboratory settings for various chemical and biological experiments.

The compound is highly soluble in water, which contributes to its effectiveness as a pH buffer. It can act as both a weak acid and a weak base, making it useful in maintaining a stable pH level in solutions. Its versatile properties and easy availability make disodium hydrogen phosphate dihydrate a commonly employed chemical in numerous applications.


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.

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