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Diss Factsheets
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EC number: 215-607-8 | CAS number: 1333-82-0
- 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:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- REPORTING FORMAT FOR THE ANALOGUE APPROACH
1. HYPOTHESIS FOR THE ANALOGUE APPROACH and ANALOGUE APPROACH JUSTIFICATION
Based on reliable textbook data (HoWi, 2017) chromic(VI) oxide is soluble in water and forms immediately chromic acid, which is only known in solution:
CrO3 + H2O ---> H2CrO4
Based on this fact the dissociation properties of chromic acid have to be considered, as this is the species existing in water, not chromium(VI) oxide.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Please refer to the respective test item in the respective endpoint study record for details!
- Reason / purpose for cross-reference:
- read-across source
- Dissociating properties:
- yes
- No.:
- #1
- pKa:
- -0.61
- Remarks on result:
- other: Temperature not indicated, room temperature assumed
- No.:
- #2
- pKa:
- 6.488
- Remarks on result:
- other: Temperature not indicated, room temperature assumed
- Conclusions:
- When chromium(VI) oxide is dissolved in water it forms immediately chromic acid: CrO3+ H2O ---> H2CrO4
Chromic acid is only known in solution.
The chromic acid dissociates in water and is in the first stage strongly dissociated and in the second stage only weakly:
1) H2CrO4<==> H++ HCrO4-with pKa= -0.61
2) HCrO4-<==> H++ CrO42-with pKa= 6.488 - Executive summary:
Based on reliable textbook data (HoWi, 2017) chromic(VI) oxide is soluble in water and forms immediately chromic acid:
CrO3+ H2O ---> H2CrO4Chromic acid is only known in solution.
The chromic acid dissociates in water and is in the first stage strongly dissociated and in the second stage only weakly:
1) H2CrO4<==> H++ HCrO4-with pKa= -0.61
2) HCrO4-<==> H++ CrO42-with pKa= 6.488
Reference
When chromium(VI) oxide is dissolved in
water it forms immediately chromic acid:
CrO3+ H2O ---> H2CrO4
Chromic acid is only known in solution.
The chromic acid dissociates in water and is in the first stage strongly dissociated and in the second stage only weakly:
1) H2CrO4<==> H++ HCrO4-with pKa= -0.61
2) HCrO4-<==> H++ CrO42-with pKa= 6.488
Description of key information
Based on reliable textbook data (HoWi, 2017) chromic(VI) oxide is soluble in water and forms immediately chromic acid:
CrO3+ H2O ---> H2CrO4
Chromic acid is only known in solution.
The chromic acid dissociates in water and is in the first stage strongly dissociated and in the second stage only weakly:
1) H2CrO4<==> H++ HCrO4-with pKa= -0.61
2) HCrO4-<==> H++ CrO42-with pKa= 6.488
Key value for chemical safety assessment
- pKa at 20°C:
- -0.61
Additional information
Temperature is not stated in the key-value source, but room temperature is assumed. The test substance dissociates in a second step weakly, but for risk assessment the first dissociation step is of relevance based on a worst-case approach, as this first step is the reason for the acidic properties of the substance.
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.
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