Search results
Results from the WOW.Com Content Network
Sodium hypophosphite (NaPO 2 H 2, also known as sodium phosphinate) is the sodium salt of hypophosphorous acid and is often encountered as the monohydrate, NaPO 2 H 2 ·H 2 O. It is a solid at room temperature, appearing as odorless white crystals. It is soluble in water, and easily absorbs moisture from the air.
One type of amphoteric species are amphiprotic molecules, which can either donate or accept a proton (H +). This is what "amphoteric" means in Brønsted–Lowry acid–base theory . For example, amino acids and proteins are amphiprotic molecules because of their amine ( −NH 2 ) and carboxylic acid ( −COOH ) groups.
Hypophosphoric acid can be prepared by the reaction of red phosphorus with sodium chlorite at room temperature. [2]2 P + 2 NaClO 2 + 2 H 2 O → Na 2 H 2 P 2 O 6 + 2 HCl. A mixture of hypophosphoric acid, phosphorous acid (H 3 PO 3) and phosphoric acid (H 3 PO 4) is produced when white phosphorus oxidises in air when partially immersed in water.
The salt is obtained by partial neutralization of phosphoric acid. The pK a of monosodium phosphate is 6.8-7.2 (depending on the physicochemical characteristics during pK a determination). [2] Heating this salt above 169 °C gives disodium pyrophosphate: 2 NaH 2 PO 4 → Na 2 H 2 P 2 O 7 + H 2 O. When heated at 550 °C, anhydrous trisodium ...
sodium salts of carboxylic acids (e. g. sodium formate, HCOONa, the sodium salt of formic acid or sodium acetate, CH 3 COONa, the sodium salt of acetic acid, etc.) and; sodium salts of inorganic acids (sulfonic acids etc.)
A species that can either accept or donate a proton is referred to as amphiprotic. An example is the H 2 O (water) molecule, which can gain a proton to form the hydronium ion, H 3 O +, or lose a proton, leaving the hydroxide ion, OH −. The relative ability of a molecule to give up a proton is measured by its pK a value.
The most important sodium compounds are table salt (NaCl), soda ash (Na 2 CO 3), baking soda (NaHCO 3), caustic soda (NaOH), sodium nitrate (NaNO 3), di- and tri-sodium phosphates, sodium thiosulfate (Na 2 S 2 O 3 ·5H 2 O), and borax (Na 2 B 4 O 7 ·10H 2 O). [7] In compounds, sodium is usually ionically bonded to water and anions and is ...
Aypical derivative is the salt [NH 4][HP(O) 2 OH]. [7] [6] Many related salts are known, e.g., RbHPHO 3, CsHPHO 3, TlHPHO 3. These salts are prepared by treating phosphorous acid with the metal carbonate. These compounds contain a layer polymeric anion consisting of HPO 3 tetrahedra linked by hydrogen bonds. These layers are interleaved by ...