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Basic Information

Molecular Structure:
CAS No.:	7789-77-7
Name:	Calcium hydrogenphosphate dihydrate
Article Data:	230
Cas Database

Formula:	CaHPO₄^.2(H₂O)
Molecular Weight:	136.057
Synonyms:	Emcompress;Emcompress Special;Monohydrogen monocalciumphosphate dihydrate;Parmcompress;Tri-Compress;Phosphoricacid, calcium salt (1:1), dihydrate (8CI,9CI);Bekapress D 2;Bonit;Budit 222;Calcium hydrogen phosphate (CaHPO4) hydrate (1:2);Calcium hydrogen phosphatedihydrate;Calcium monohydrogen orthophosphate dihydrate;Calcium monohydrogenphosphate dihydrate;Calcium phosphate (CaHPO4) dihydrate;Calcium phosphatedihydrate;Calipharm;Dibasic calcium phosphate dihydrate;Calcium hydrogen phosphate;
EINECS:	231-826-1
Density:	2.31 g/cm³
Melting Point:	109°C -H?O
Boiling Point:	158oC at 760 mmHg
Solubility:	Slightly soluble in water. Soluble in dilute hydrochloric, nitric, and acetic acid. Insoluble in alcohol
Appearance:	white crystalline solid
Hazard Symbols:	Xi
Risk Codes:	36/37/38
Safety:	26-36
PSA:	111.69000
LogP:	-0.18080

Synthetic route

: calcium hydrogen phosphate dihydrate

: 7789-77-7
calcium hydrogen phosphate

Conditions

Conditions	Yield
In melt byproducts: Ca3(PO4)2*99H2O; melting with decompn. at 36°C;;	99.85%
With (NH4)2CO3 or NH4H2PO4 In water byproducts: CaCO3, hydroxylapatite, P2O5; decompn. with aq. (NH4)2CO3 or aq. NH4H2PO4 soln. at various conditions;; P2O5 in soln.;;
With phosphoric acid In not given byproducts: H2O; dissolving 95 g of dihydrate in 500 g 35 % H3PO4 at 25°C; heating at 100-110°C; filtration of hot soln.;; 6-8 fold washing with abs. alcohol, drying at 100°C; contains crystal water;;

: disodium hydrogenphosphate

: calcium chloride

: 7789-77-7
calcium hydrogen phosphate

Conditions

Conditions	Yield
With potassium dihydrogenphosphate In water aq. CaCl2 soln;; 3 times washing with 330 ml aq. H3PO4, washing with abs. ethanol; pure; contains 0.04 mol H2O after calcination at 900.degreee.C;;	95%
In not given addn. of CaCl2 to neutral Na2HPO4 soln.;;
With hydrogenchloride; ammonia In water dissolving ppt. from aq. CaCl2 soln. and Na2HPO4 in HCl, dropwise addn. of 0.6 % aq. NH3 on water bath, replacement of vaporized H2O;; crystn. after 2-3 weeks;;
With HCl; NH3 In water dissolving ppt. from aq. CaCl2 soln. and Na2HPO4 in HCl, dropwise addn. of 0.6 % aq. NH3 on water bath, replacement of vaporized H2O;; crystn. after 2-3 weeks;;
In not given

: 2C8H18O4P(1-)*4C8H19O4P*Ca(2+)

: 7789-77-7
calcium hydrogen phosphate

Conditions

Conditions	Yield
With calcium methylate In methanol at 150℃; for 48h; Autoclave;	45%

: diammonium phosphate

: 13477-34-4
calcium(II) nitrate

: 7789-77-7
calcium hydrogen phosphate

Conditions

Conditions	Yield
In water for 0.0333333h; pH=5 - 9;

: fluorosilicic acid

: 86119-84-8, 7664-38-2
phosphoric acid

: calcium oxide

A: 7789-77-7
calcium hydrogen phosphate

B: calcium fluoride

C: tricalcium diphosphate

D: hydroxyapatite

E: 112926-00-8, 7631-86-9
silica gel

Conditions

Conditions	Yield
In water Kinetics; byproducts: H2O; gastight neutralization reactor, stirring in turbulent regime, 23 °C, addn. of CaO (varying stochiometry) to the acid mixture; withdrawn samples filtered, anal.;

...Expand

: tricalcium diphosphate

: 10102-44-0
Nitrogen dioxide

A: 7789-77-7
calcium hydrogen phosphate

B: 13477-34-4
calcium(II) nitrate

Conditions

Conditions	Yield
reaction of NO2 with moist Ca phosphate;;
reaction of NO2 with moist Ca phosphate;;

...Expand

: 7697-37-2
nitric acid

A: 7789-77-7
calcium hydrogen phosphate

B: calcium dihydrogen phosphate

C: 13477-34-4
calcium(II) nitrate

Conditions

Conditions	Yield
With phosphate minerals Decompn. of phosphate minerals by HNO3;;

...Expand

: 14808-79-8
Sulfate

: 14265-44-2
Phosphate

: calcium hydroxide

A: 7789-77-7
calcium hydrogen phosphate

B: calcium sulfate

Conditions

Conditions	Yield
In neat (no solvent) calcination of ppt.;;

...Expand

: 7722-76-1
ammonium dihydrogen phosphate

: calcium sulfate dihydrate

A: 7789-77-7
calcium hydrogen phosphate

B: ammonium sulfate

C: 7732-18-5
water

Conditions

Conditions	Yield
With NH3 In neat (no solvent) NH4H2PO4 from reaction of superphosphate with ammonia; addn. of further amounts of ammonia;;
In neat (no solvent)

...Expand

: 14887-42-4
potassium dihydrophosphate*H3PO4

A: 7789-77-7
calcium hydrogen phosphate

B: potassium dihydrogenphosphate

Conditions

Conditions	Yield
With CaCO3 In water
With calcium carbonate In water

Raw Materials

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Chemistry

Product Name:Calcium hydrogenphosphate dihydrate(7789-77-7)
CAS No:7789-77-7
MF: CaH₅O₆P
MW: 172.09
mp : 109°C
density : 2.44 g.cm³ (20 °C )
Solubility in water:Soluble
Synonyms of Calcium hydrogenphosphate dihydrate(7789-77-7): CALCII HYDROGENOPHOSPHAS DIHYDRICUS;CALCIUM HYDROGEN PHOSPHATE;CALCIUM HYDROGEN PHOSPHATE-2-HYDRATE;CALCIUM HYDROGENPHOSPHATE DIHYDRATE;CALCIUM MONOHYDROGEN PHOSPHATE DIHYDRATE;CALCIUM PHOSPHATE, DIBASIC;CALCIUM PHOSPHATE DIBASIC, DIHYDRATE;CALCIUM PHOSPHATE DIHYDRATE, DIBASIC
Molecular Structure of Calcium hydrogenphosphate dihydrate(7789-77-7):

Uses

Calcium hydrogen phosphate(7789-77-7) is believed to be precursor of apatite and is found in guano-rich caves; formed by the interaction of guano with calcite and clay at a low ph

Toxicity Data With Reference

Inhalation:Material is irritating to mucous membranes and upper respiratory tract. May be harmful if inhaled.
Skin:Calcium hydrogen phosphate may cause skin irritation. May be harmful if absorbed through the skin.
Eyes:Calcium hydrogen phosphate cause eye irritation.
Ingestion:May be harmful if swallowed.

Consensus Reports

First Aid Measures:
Ingestion:If swallowed, wash out mouth with water provided person is conscious. Call a physician.
Inhalation:If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.
Skin:In case of contact, immediately wash skin with soap and copious amounts of water.
Eyes:In case of contact, immediately flush eyes with copious amounts of water for at least 15 minutes.

Storage:Keep tightly closed.

Safety Profile

Hazard Codes : Xi
Risk Statements : 36/37/38
Safety Statements : 26-36
WGK Germany : 1

Specification

Personal Protection:Compatible chemical-resistant gloves. Chemical safety goggles.

Fire Fighting:Extinguish using Water spray. Carbon dioxide, dry chemical powder, or appropriate foam. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.

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