Dipotassium phosphate

• Potassium dihydrogen phosphate
• Potassium phosphate secondary
• Potassium phosphate dibasic

Colorless, odorless solid

Fixed

2.44 g · cm -3

≈ 340 ° C ( decomposition)

Very well in water (1600 g · l-1 at 20 ° C)

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Dipotassium hydrogen phosphate is a chemical compound from the group of hydrogen phosphates. It is in the form of a colorless and odorless solid and is the secondary phosphate of ortho- phosphoric acid dar. It also happens as the trihydrate.

Production and representation

Dipotassium hydrogen phosphate can be obtained (for example, potassium carbonate or potassium chloride), by neutralization of phosphoric acid with potassium hydroxide or potassium salts.

Properties

An aqueous solution of dipotassium hydrogen phosphate is slightly alkaline. When heated, dipotassium hydrogen phosphate is the elimination of water in the corresponding Tetrapotassium on:

Use

Dipotassium hydrogen phosphate is used for the preparation of buffer solutions, together with potassium or as a component of culture media of bacteria.

In the food industry, dipotassium hydrogen phosphate is used as a complexing agent, acidity regulator and melting salt. It is together with the primary ( KH2PO4 ) and tertiary potassium phosphate ( K3PO4 ) in the EU as a food additive under the joint number E 340 ( " potassium phosphates " ) approved for certain foods, each with different maximum quantity restrictions. After the additive approval regulations are the - for most approved phosphates largely uniform - individual specifications for a wide range with many different types of food. The approved maximum amounts vary from 0.5 to 50 grams per kilogram ( in creamer for ATM), or even the lack of a fixed restriction ( quantum satis - as necessary nutritional supplements and partly in chewing gum ). Phosphoric acid and its salts are in the hyperactivity suspected of causing allergic reactions and osteoporosis. It was determined an allowable daily dose of 70 milligrams per kilogram of body weight for the total amount of recorded phosphoric acid and phosphates.

It also serves as a fertilizer.

Swell

• Potassium compound
• Phosphate