Hydrogen Phosphate

Ammonium hydrogen phosphate is formed when a solution of phosphoric acid is added to ammonia until the solution is distinctly acidic. It crystallizes in quadratic prisms. Monoammonium phosphate is often used in the blending of dry agricultural fertilizers.

Calcium hydrogen phosphate is the name given to a family of minerals containing calcium ions (Ca2+) together with orthophosphates (Po43-), metaphosphates or pyrophosphates (P2o74-) and occasionally hydrogen or hydroxide ions

Potassium hydrogen phosphate,  is a soluble salt which is used as a fertilizer, a food additive and a fungicide. It is a source of phosphorus and potassium. It is also a buffering agent. When used in fertilizer mixtures with urea and ammonium phosphates, it minimizes escape of ammonia by keeping the ph at a relatively low level.

Sodium hydrogen phosphate (Na2Hpo4) is a sodium salt of phosphoric acid. It is a white powder that is highly hygroscopic and water soluble. [1] it is therefore used commercially as an anti-caking additive in powdered products.