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Ammonium dihydrogen phosphate

description Chemical properties Solubility in water(g/100ml) Content analysis Toxicity Application Preparation method References
Ammonium dihydrogen phosphate
Ammonium dihydrogen phosphate
Chemical Name:
Ammonium dihydrogen phosphate
Molecular Formula:
Formula Weight:
MOL File:

Ammonium dihydrogen phosphate Properties

Melting point:
190 °C (dec.)(lit.)
1.02 g/mL at 20 °C
storage temp. 
H2O: 0.1 M at 20 °C, clear, colorless
White or colorless
3.8-4.4 (25℃, 50mg/mL in H2O)
Water Solubility 
368 g/L (20 ºC)
CAS DataBase Reference
7722-76-1(CAS DataBase Reference)
EPA Substance Registry System
Phosphoric acid, monoammonium salt(7722-76-1)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xi
Risk Statements  36/37/38
Safety Statements  24/25-36-26
WGK Germany  1
HazardClass  8
PackingGroup  III
HS Code  31054000
Hazardous Substances Data 7722-76-1(Hazardous Substances Data)
Signal word:
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

Ammonium dihydrogen phosphate price More Price(38)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 09709 Ammonium phosphate monobasic BioUltra, ≥99.5% (T) 7722-76-1 50g $37.1 2018-11-13 Buy
Sigma-Aldrich 09709 Ammonium phosphate monobasic BioUltra, ≥99.5% (T) 7722-76-1 1kg $242 2018-11-13 Buy
Alfa Aesar 010633 Ammonium dihydrogen phosphate, Puratronic?, 99.995% (metals basis) 7722-76-1 100g $413 2018-11-16 Buy
Alfa Aesar 010633 Ammonium dihydrogen phosphate, Puratronic?, 99.995% (metals basis) 7722-76-1 25g $115 2018-11-16 Buy
Strem Chemicals 02-0500 Ammonium dihydrogen phosphate (99.998%) PURATREM 7722-76-1 10g $35 2018-11-13 Buy

Ammonium dihydrogen phosphate Chemical Properties,Uses,Production


Ammonium dihydrogen phosphate (ADP) is a transparent, piezoelectric crystal containing no water of crystallization. Single crystals of this material were originally developed for use in underwater sound projectors and hydrophones. Transducer problems during World War II fostered a joint study program on this material by Bell Telephone Laboratories, Brush Development Company and the Naval Research Laboratories. An adequate and relatively simple technology was developed in this joint effect to grow ADP crystals and to fabricate them into sonar transducers. ADP is comparable to ordinary table salt in workability, brittleness and solubility. Blumenthal was one of the first investigators to demonstrate the successful microwave modulation of light by using the electrooptic effect in ADP.

Chemical properties

colorless transparent tetragonal crystal. soluble in water, slightly soluble in alcohol, insoluble in acetone.

Solubility in water(g/100ml)

Dissolving grams per 100 ml of water at different temperatures (° C):
22.7 g/0 ° C; 39.5 g/10 ° C; 37.4 g/20 ° C; 46.4 g/30 ° C; 56.7 g /40 ° C; 82.5 g/60 ° C; 118 g/80 ° C; 173 g/100 ° C

Content analysis

Accurately weighed about 500mg sample, dissolved in 50ml of water, with 0.1mol/L sodium hydroxide titration to pH 8.0. per mL, 0.1mol/L sodium hydroxide is equivalent to diammonium phosphate [NH4H2PO4] 11.50 mg.


ADI: 0 to 70 mg/kg (amount of total phosphate as phosphorus; FAO/WHO, 2001).
GRAS (FDA, § 184.1141a, 2000).


Leavening agent, dough regulator, yeast food, brewing fermentation additives and buffer in the food industry
Animal feed additives
Nitrogen and phosphorus compound fertilizer with highly efficient
Fire retardant for wood, paper, fabric, dispersant for fiber processing and dyeing industry, glaze for enamel, cooperating agent for fire retardant coating, decontamination agent for match stalk and candle core
In indurstis of printing plate and pharmaceutical manufacturing

Preparation method

Venturi loop reaction method: 85% thermal phosphoric acid will be diluted 1.3 to 1.4 times, after the measurement into the venturi tube flow mixing reactor, where it is sufficiently homogeneously mixed and reacted with the incoming ammonia gas, and the reaction process is continued in the pipeline. Finally the qualified liquid enters into the cycle reaction tank, adjusting the Ph value between the range 4.4 to 4.6, filtering and cooling the filtrate down to 26 oC, obtaining the crystal solid, separating and dehydrating, and then drying it to obtain the dihydrogen phosphate Ammonium products.
H3PO4 + NH3 → NH4H2PO4
Neutralization method: firstly dilute the phosphoric acid to get a solution with 50% to 55% concentration, and then take some measured solution into an enamel reaction tank with stirring and jacket. In stirring, the ammonia gas is slowly added into the ammonia tube distributor for neutralization. Waiting till the Ph value of the neutralized solution gets between 4.2~4.6, filter it immediately and send it into the cooling crystallization mold, then obtain crystallization when the temperature gets down to 26 °. Dry after dehydration and then obtain ammonium dihydrogen phosphate products.
 H3PO4 + NH3 → NH4H2PO4
Mother liquor from separator is added into the iron remover with ammonium sulfide for removing iron, filtering, and then senting to the acid tank to adjust the acidity to Ph4.4~4.6. Refined mother liquor is supplied for recycling.
Metathesis method Calcium dihydrogen phosphate and ammonium sulfate were melted at 85-90 °C to produce a clear solution below the saturation concentration. Firstly, the calcium dihydrogen phosphate solution is added into the reactor, and the temperature of the steam is raised to 95 oC under stirring, and the ammonium sulphate solution is added slowly for metathesis reaction to produce ammonium dihydrogen phosphate and calcium sulphate. The end point of the reaction is that Ph value is about 4.4 to 4.6. After filtration, the filtrate is sent into the evaporator to the boiling point of 108 °C, and then is sended into the cooling crystallizer, cooling to 40 °C for crystallization, centrifugal separating, drying, and then obtaining ammonium dihydrogen phosphate product.
Ca (H2PO4) 2 H2O + (NH4) 2SO4 → This product + CaSO4 + H2O
The separated calcium sulfate is filtered and washed to produce a by-product. The lotion is returned for the feed.


Chemical Properties

Ammonium phosphate occurs in two forms-the monobasic, NH4H2P04, and dibasic,(NH4)2HP04, forms, It is a white crystalline solid that is soluble in water. Ammonium phosphate is a product of the reaction between ammonia and phosphoric acid.Ammonium phosphate is an important fertilizer and is used as a fire retardant


Used as buffer solutions.


As baking powder with sodium bicarbonate; in fermentations (yeast cultures, etc.); fireproofing of paper, wood, fiberboard, etc.


ChEBI: The ammonium salt of phosphoric acid (molar ratio 1:1).

Purification Methods

Crystallise it from water (0.7mL/g) between 100o and 0o.

Ammonium dihydrogen phosphate Preparation Products And Raw materials

Raw materials

Preparation Products

Ammonium dihydrogen phosphate Suppliers

Global( 339)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Jiangsu Kolod Food Ingredients Co.,Ltd.
+86-518-85110578 18805133257
+86-518-85110578 CHINA 92 60
Shenzhen Sendi Biotechnology Co.Ltd.
0755-23311925 18102838259
0755-23311925 CHINA 3218 55
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22119 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20795 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32764 55
Hangzhou FandaChem Co.,Ltd.
0086 158 5814 5714 (Mobile; WhatsApp; Telegram)
+86-571-56059825 CHINA 1885 55
Anhui Royal Chemical Co., Ltd.
+86-025-86736275 CHINA 789 55
Shanghai Zheyan Biotech Co., Ltd.
18017610038 CHINA 3625 58
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 25126 65
klamar reagent 4001650900
021-64897811 China 1997 55

View Lastest Price from Ammonium dihydrogen phosphate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2017-08-30 Ammonium Dihydrogen Phosphate; Monoammonium Phosphate
US $20.00 / KG 25KG 96.0%---102.0% 200 tons Jiangsu Kolod Food Ingredients Co.,Ltd

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