Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 231-913-4 | CAS number: 7778-77-0
Endpoint summary
Administrative data
Description of key information
Additional information
Typically the purity of potassium dihydrogenorthophosphate is Ca. 80% (dry weight, after excluding water).
The substance may contain the impurities indicated below, derived from the production process, each one present at the concentrations indicated below:
Dipotassium hydrogenorthophosphate - # EINECS : 231-834-5: <15%
Potassium sulphate - # EINECS : 231-915-5:<10%
Potassium chloride (KCl) - #EINECS: 231-211-8: <5%
Calcium hydrogenorthophosphate - #EINECS:231-826-1:<5%
Other inorganic phosphates or other inorganic substances related to the registered substance which do not significantly affect the toxicological and ecotoxicological properties of the registered substance are present in quantities of <5% in total. There are no hazardous impurities present within the substance at levels >1%.
Potassium dihydrogenorthophosphate has a reported boiling point of Ca. 253°C, a boiling point of >450°C. The vapour pressure of the test material has been determined to be 4.5 x 10-15 Pa at 25ºC.
Potassium dihydrogenorthophosphate is considered to be very soluble ( 208 g/l of solution at 20.0 ± 0.5°C). The pH of this solution, observed in the water solubility study, was pH 4.2 -4.5. The water solubility study conducted on potassium dihydrogenorthophosphate made the following observations:The effect of temperature over the range 10 to 30°C has been considered not to have had a significant influence on the observed solubility of the test material (range 173 to 239 g/l).
An assessment of the solubility of the test material over the environmentally relevant pH range of 4 to 9 gave solubility results and final solution pH’s similar to those obtained using unbuffered water. Thus, it can be anticipated that the water solubility of the test material over the pH range 4 to 9 would be constant, essentially due to the low buffering activities seen in the environment.
Potassium dihydrogenorthophosphate is not considered to possess any of the following hazardous physico-chemical properties: autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
