Sodium dihydrogen phosphate dihydrate 99 +% food grade, FCC, E339i

What is Sodium Dihydrogen Phosphate?

Sodium dihydrogen phosphate or monosodium phosphate is a colorless and odorless salt made from the ions Na + and H2PO4−.

Like other phosphates, sodium dihydrogen phosphate is obtained from ores such as apatite.

In the laboratory this can be done by neutralizing caustic soda with phosphoric acid.

The dihydrate can be crystallized in pure form from a cold water/ethanol solution.

What is Sodium Dihydrogen Phosphate used for?

-Laxative

Sodium dihydrogen phosphate is a medicinally active ingredient of laxatives.

-Pharmaceutical excipient

As a pharmaceutical excipient, sodium dihydrogen phosphate is a component of drugs administered in aqueous form (e.g., nasal sprays).

-Food technology

In the food industry, sodium dihydrogen phosphate is used as a complexing agent, acidity regulator and melting salt. Together with disodium hydrogen phosphate and tri-sodium phosphate, it is approved in the EU as a food additive under the generic number E 339 ("sodium phosphate") for certain foods, each with different restrictions on maximum amounts. According to the Additive Approval Ordinance, these - largely uniform for most approved phosphates - are individual specifications for a wide variety of foods. The maximum allowed amounts range from 0.5 to 50 grams per kilogram (in creamer for vending machines) or the lack of a fixed restriction (quantum satis - as required, for dietary supplements and sometimes for chewing gum). Phosphorus is suspected of causing hyperactivity, allergic reactions and osteoporosis. For the total intake of phosphoric acid and phosphates, a permissible daily dose of 70 milligrams per kilogram of body weight has been established.

-Phosphate buffer

Sodium dihydrogen phosphate is used in biochemistry and molecular biology for the production of buffer solutions. By mixing sodium dihydrogen phosphate with disodium hydrogen phosphate solution or by adding sodium hydroxide solution, a phosphate buffer with a specific pH value (pH 6-8) can be produced.

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Technical properties

Empirical formula NaH₂PO₄ · 2 H₂O
Molar mass (M) 156,01 g/mol
Density (D) 1,91
Melting point (mp)60 °C
Solubility 850 g/l (H₂O, 20 °C)
WGK 1
CAS No.[13472-35-0]
EG-Nr. 231-449-2

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