Melting point :340°C(anhydrous substance),decomposes
bulk density :800kg/m3
storage temp. :room temp
solubility :H₂O: 4 M at 20 °C, clear, colorless
pka :7.21
form :Crystalline Powder
color :White
PH :9.1-9.4 (25℃, 50mg/mL in H2O)
Water Solubility :SOLUBLE
Sensitive :Hygroscopic
Merck :14,7658
Stability :Stable. Incompatible with strong oxidizing agents.
InChI :1S/2K.H3O4P.3H2O/c;;1-5(2,3)4;;;/h;;(H3,1,2,3,4);3*1H2/q2*+1;;;;/p-2
InChIKey :XQGPKZUNMMFTAL-UHFFFAOYSA-L
SMILES :O.O.O.[K+].[K+].OP([O-])([O-])=O
CAS DataBase Reference :16788-57-1(CAS DataBase Reference)
Absorption :≤0.01 at 260nm
≤0.01 at 280nm

Symbol(GHS):
Signal word:	Warning
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 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. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352 IF ON SKIN: wash with plenty of soap and water. 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.