Sodium acid phosphate

Orthophosphate salts are generally prepared by the partial or total neutralization of orthophosphoric acid. Phase equiUbrium diagrams are particularly usehil in identifying conditions for the preparation of particular phosphate salts. The solution properties of orthophosphate salts of monovalent cations are distincdy different from those of the polyvalent cations, the latter exhibiting incongment solubiUty in most cases. The commercial phosphates include alkah metal, alkaline-earth, heavy metal, mixed metal, and ammonium salts of phosphoric acid. Sodium phosphates are the most important, followed by calcium, ammonium, and potassium salts. 

The sodium salt of phosphoric acid, sodium phosphate (NaH2P04), is weakly acidic, and is used with sodium bicarbonate to make baking powders. Other acids used in baking powder are fumaric acid and tartaric acid. 

This is the amount of heat absorbed when acid sodium phosphate Iosifs 18 kilograms of water of crystallization as vapour such an amount will be found calorimctrically. 

The acid sodium phosphate NaH2P04 can be dehydrated quantitatively to the corresponding crystalline diphosphate. Sodimn trimetaphosphate, a crystalline salt with a ring structure anion, is also stable and complicates the polymerization of NaH2P04 on dehydration. Thilo and Grunze (52) have shown that under equilibrium conditions according to the phase rule five different temperature regions can be delineated. Three different quadrupel points are possible ... 

Acid sodium phosphate E339 Kalipol 32 monosodium orthophosphate monosodium phosphate phosphoric acid, monosodium salt primary sodium phosphate sodium biphosphate sodium dihydrogen orthophosphate sodium dihydrogen phosphate. 

Sodium Phosphate, Monobasic. Sodium biphosphate sodium dihydrogen phosphate acid sodium phosphate monosodium orthophosphate primary sodium phosphate. H2Na04P mol wt 119.98. H 1.68%, Na 19.16%, O 53.34%, P 25.81%. NaHjPO.. It is about 99% pure. 

Table 22 Tryptophan fluorescence lifetimes and relative emission intensities in aqueous solution in function of pH citric acid-sodium phosphate buffer. Ajk 280 nm emission through 350 nm cut-offfilter, T = 20 °C...

Electrolytes which do not afford ionic complexes with common hexitols and reducing sugars are aqueous solutions of lead acetate, copper sulfate, zinc sulfate, ferrous ammonium sulfate, calcium chloride, potassium dichromate, ferric chloride (pH 3), aluminum sulfate, magnesium sulfate, sodium sulfate, potassium antimonyl tartrate, sodium arsenate or arsenic acid, sodium phosphate, and hydrochloric acid. It is not certain whether sodium aluminate (in 0.1 N sodium hydroxide) affords ionic complexes with carbohydrates, as aqueous alkali, alone, permits their migration during electrophoresis. 

Figure 5 pH changes during the cooling (and freezing) and rewarming of an ice-seeded citric acid-sodium phosphate buffer mixture, illustrating the effects of delayed crystallisation of sodium phosphate reproduced from Pikal (unpublished)... 

Synonyms Acid sodium phosphate Monobasic sodium phosphate Monosodium dihydrogen phosphate Monosodium orthophosphate Monosodium phosphate MSP Phosphoric acid monosodium salt Primary sodium phosphate Sodium acid phosphate Sodium biphosphate Sodium dihydrogen phosphate Sodium dihydrogen phosphate (1 2 1) Sodium phosphate monobasic Sodium phosphate primary Classification Phosphate sait Empirical H2Na04P Formula NaHiPO,... 

Acid red 27, trisodium salt. See Amaranth Acid rhodamine B. SeeAcidred52 Acid rubin. See Acid fuchsin Acid rubine. SeeAcidred14 Acids, coconut, hydrogenated. See Hydrogenated coconut acid Acids, corn. See Corn acid Acids, cottonseed. See Cottonseed acid Acids, lanolin. See Lanolin acid Acids, linseed. See Linseed acid Acids, menhaden, hydrogenated. See Hydrogenated menhaden acid Acid sodium phosphate. See Sodium phosphate... 

About the middle of the nineteenth century, the use of certain phosphorus compounds (rather than the element) became the vogue. The laxative properties of sodium phosphates were recognised and in the same period hypophosphites (as Na, Mg or Ca salts) were introduced for the treatment of neurasthenia and other nervous deficiencies. These were all considerably less toxic than the element itself and were followed by glycerophosphates (as Na, Ca and other salts) which were believed to function as brain nutrients or nerve tonics . The use of hypophosphites and glycerophosphates persisted well into the twentieth century, but they are now considered to be of very limited value for these purposes. A syrup of phosphorus , described in British Pharmacopea 1885, contained phosphoric acid, sodium phosphate and iron sulphate among other ingredients. Commercial exploitation of products of this kind was inevitable (Hgure 12.22). Modem dietary supplements are often based on collections of vitamins which usually include Bg and B,2. These two vitamins form part of phosphate ester enzymes (e.g. Equation ll.lOSj). 

The reaction mixtures contained 2yg enzyme, 15 mg protein substrate and 0.1 M citric acid-sodium phosphate buffer in a total volume of 2 ml. The assays were performed at 37 for 30 min. 

Aq. citric acid-sodium phosphate buffer soln. of pH 5.4 added to a soln. of 4.0 g. 8,4 -dimethoxyflavylium chloride in warm methanol, and allowed to cool slowly 3.0 g. 2-hydroxy-3,4 -dimethoxychalcone.—This reaction can be reversed at low pH. F. e. s. L. Jurd, J. Org. Ghem. 28, 987 (1963). 

Klinkenberg, H., Beeren,T., and Van Borm, W. (1994). Multielement analysis using flow injection inductively coupled plasma mass spectrometry Analytical aspects of multielement determinations in highly concentrated solutions of phosphoric acid, sodium phosphate and sodium nitrate. Spectrochim. Acta, Part B 49B(2), 171. 

Deliming cf glycerine can be carried out in such a manner that the dissolved lime is converted into an insoluble compound which can be removed by filtration. To this end sodium carbonate, sodiuin oxalate, or acid sodium phosphate is added to the heated glycerine, which causes the formation of insoluble calciuin carbonate, oxalate, or phosphate. 

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