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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer-reviewed handbook data
Principles of method if other than guideline:
In the peer-reviewed handbook, information on the melting point are reported.
Type of method:
other: peer-reviewed handbook data
Decomposition:
yes
Decomp. temp.:
> 100 °C
Conclusions:
When heat above 100 °C, potassium hydrogencarbonate decomposes into potassium carbonate, water and carbon dioxide.
Executive summary:

When heated, KHCO3decomposes into CO2and H2O. Between 100 and 110 °C a weight loss of about 4% can be noticed. Between 175 and 185oC the conversion into K2CO3is complete after 6 hours. Between 200 and 210oC the conversion is complete after only 2 hours.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Handbook data, peer reviewed
Principles of method if other than guideline:
In the peer-reviewed handbook, information on the melting point are reported.
GLP compliance:
not specified
Type of method:
other: determination method not reported
Decomposition:
yes
Decomp. temp.:
ca. 100 °C

According to the information provided in the peer-reviewed handbook, the melting point of potassium hydrogencarbonate can not be determined due to decomposition at a temperature of about 100°C.

Conclusions:
The melting point of potassium hydrogencarbonate can not be determined due to decomposition at a temperature of about 100°C.
Executive summary:

According to the information provided in the peer-reviewed handbook, the melting point of potassium hydrogencarbonate can not be determined due to decomposition at a temperature of about 100°C.

Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Database data and handbook data, at least one source peer reviewed
Principles of method if other than guideline:
In the peer-reviewed handbook, information on the melting point are reported.
GLP compliance:
no
Type of method:
other: data from peer-reviewed handbook
Decomposition:
yes
Decomp. temp.:
200 °C
Conclusions:
Potassium hydrogencarbonate decomposes into potassium carbonate, water and carbon dioxide.
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: data are from peer-reviewed handbook
Principles of method if other than guideline:
In the peer-reviewed handbook, information on the melting point are reported.
Type of method:
other: peer-reviewed handbook data
Decomposition:
yes
Decomp. temp.:
> 120 °C
Conclusions:
When heated above 120oC, potassium hydrogencarbonate decomposes into potassium carbonate, water, and carbon dioxide.
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Database data and handbook data, at least one source peer reviewed
Principles of method if other than guideline:
In the peer-reviewed handbook, information on the melting point are reported.
GLP compliance:
not specified
Type of method:
other: data from peer-reviewed handbook
Decomposition:
yes
Decomp. temp.:
127 °C
Sublimation:
no
Conclusions:
Thermal decomposition at temperatures above approximately 127°C

Description of key information

When heated above 100 °C, potassium hydrogencarbonate begins to decompose into potassium carbonate, water and carbon dioxide.

Key value for chemical safety assessment

Additional information

When heated, KHCO3 decomposes into CO2 and H2O. Between 100 and 110 °C a weight loss of about 4% can be noticed. Between 175 and 185 oC the conversion into K2CO3 is complete after 6 hours. Between 200 and 210 oC the conversion is complete after only 2 hours.