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EC number: 227-177-9 | CAS number: 5698-98-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2013
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 112 (Dissociation Constants in Water)
- GLP compliance:
- no
- Dissociating properties:
- yes
- No.:
- #1
- Temp.:
- 19.5 °C
- Remarks on result:
- other: Dissoziationskonstante bei 0,05 mol/l ist 0,06
- No.:
- #2
- Temp.:
- 19.5 °C
- Remarks on result:
- other: Dissoziationskonstante bei 0,03 mol/l ist 0,06
- No.:
- #3
- Temp.:
- 19.5 °C
- Remarks on result:
- other: Dissoziationskonstante bei 0,01 mol/l ist 0,07
- No.:
- #4
- Temp.:
- 19.5 °C
- Remarks on result:
- other: Dissoziationskonstante bei 0,005 mol/l ist 0,08
- No.:
- #5
- Temp.:
- 19.5 °C
- Remarks on result:
- other: Dissoziationskonstante bei 0,003 mol/l ist 0,09
- Conclusions:
- Magnesium diacrylate shows the typical behavior of a weak electrolyte in dilute aqueous solutions. The degree of dissociation increases with increasing dilution. The dissociation constant at 0,05 mol/L is 0.06 and at 0,003 mol/L 0.09.
Reference
- Umrechnung
Leitfähigkeiten in Äquivalentleitfähigkeiten
Konzentration mol/L |
0,003 |
0,005 |
0,010 |
0,030 |
0,050 |
MgAA - Leitfähigkeit mS |
0,580 |
0,908 |
1,585 |
4,165 |
6,400 |
NaAA - Leitfähigkeiten mS |
0,300 |
0,455 |
0,878 |
2,390 |
3,900 |
ϫ MgAA mS/m2 mol |
0,037 |
0,035 |
0,031 |
0,027 |
0,025 |
ϫ NaAA mS/m2 mol |
0,039 |
0,035 |
0,034 |
0,031 |
0,030 |
- Auswertung
Äquivalentleitfähigkeit gegen Wurzel der Konzentration
(für starke Elektrolyte ergibt dies eine Gerade, für schwache
Elektrolyte nicht)
Ermittlung der Grenzleitfähigkeit für c = 10-20mol/L
(c mol/L)1/2 |
ϫ MgAA |
ϫ NaAA |
0,055 |
0,037 |
0,039 |
0,071 |
0,035 |
0,035 |
0,100 |
0,031 |
0,034 |
0,173 |
0,027 |
0,031 |
0,224 |
0,025 |
0,030 |
Graph siehe Anhang
- Berechnung der Dissoziationskonstanten
Für MgAA: αi=ϫiMgAA/ϫ0MgAA oder analog für NaAA:αi=ϫiNaAA/ϫ0 NaAA
Tabelle: Dissoziationskonstanten in Abhängigkeit von der Konzentration
Konzentration mol/L |
α NaAA |
α MgAA |
0,05 |
0,10 |
0,06 |
0,03 |
0,10 |
0,06 |
0,01 |
0,11 |
0,07 |
0,005 |
0,12 |
0,08 |
0,003 |
0,13 |
0,09 |
Magnesiumdiacrylat zeigt in verdünnten wässrigen Lösungen das
typische Verhalten eines schwachen Elektrolyten. Der Dissoziationsgrad
nimmt mit steigender Verdünnung zu.
Bei 0,05 mol/L sind ca. 6 % vollständig dissoziiert.
Bei 0,003 mol/L sind ca. 9% vollständig dissoziiert.
Description of key information
Magnesium diacrylate shows the typical behavior of a weak electrolyte in dilute aqueous solutions. The degree of dissociation increases with increasing dilution. The dissociation constant at 0,05 mol/L is 0.06 and at 0,003 mol/L 0.09.
Key value for chemical safety assessment
Additional information
For Acrylic acid, the pKa value of 4.25 was determined in a peer-reviewed risk assessment (European Union Risk Assessment Report acrylic acid, European Chemicals Bureau, European Commision Institute for Health and Consumer Protection European Chemicals Bureau, 2002).
For Magnesium acrylate: It is expected that at neutral pH, which is relevant for the environment, Magnesium acrylate is not completely dissociated into magnesium cation and the acrylate anions. As typical for a salt of an organic acid, the dissociation is not complete at neutral pH in water. According to Arrhenius theory of electrolyte dissociation, the molecules of an electrolyte in solution are constantly splitting up into ions and the ions are constantly reuniting to form unionized molecules. Therefore, a dynamic equilibrium exists between ions and unionized molecules of the electrolyte in solution. This is also true for the weak base magnesium diacrylate which is in equilibrium with its ions magnesium cation, magnesium monoacrylate cation and acrylate anion. According the law of Ostwald the degree of ionization increases on dilution. It is expected that at the used test concentrations in toxicity testing magnesium acrylate is only partly dissociated.
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