KH2PO4 is the acid, with a pH in the range of 4.4-4.7. K2HPO4 has a pH of 8.0.
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Yes, KH2PO4 (potassium dihydrogen phosphate) is an acid because it can donate a hydrogen ion in solution. K2HPO4 (potassium hydrogen phosphate) is a salt formed by the partial neutralization of an acid and a base, making it neutral.
Dihydrogen phosphate is a bit more acidic (H+ donor) than basic (H+ gaining) but combined it is called ampholytic.
Dipotassium phosphate (K2HPO4) - also phosphoric acid, dipotassium salt; dipotassium hydrogen orthophosphate; potassium phosphate, dibasic - is a highly water-soluble salt which is often used as a fertilizer, food additive and buffering agent. It is a common source of phosphorus and potassium. The pH of a dipotassium phosphate solution is almost neutral. It is formed by the stoichiometric neutralization of phosphoric acid with potassium hydroxide: H3PO4 + 2 KOH → K2HPO4 + 2 H2O It reacts with phosphoric acid to generate monopotassium phosphate: K2HPO4 + H3PO4 → 2 KH2PO4
One common acid used in fertilizers is sulfuric acid. It is used to lower the pH of the soil and make certain nutrients more available to plants.
To make a 1M KH2PO4 buffer solution, dissolve 136.09 grams of KH2PO4 in enough water to make a final volume of 1 liter. Always ensure that the pH of the solution is adjusted to your desired value using an appropriate acid or base, such as NaOH or HCl.
To make a 0.5 M solution of potassium dihydrogen orthophosphate (KH2PO4), you would need to weigh out 13.5 grams of KH2PO4 and dissolve it in water to make 1 liter of solution. Be sure to use a balance to accurately measure the amount of KH2PO4 needed for the desired molarity.
KH2PO4, also known as potassium dihydrogen phosphate, can act as both an acid and a base depending on the circumstances. It can donate a proton (H+) and act as an acid in a reaction, or it can accept a proton and behave as a base.