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EC number: 231-302-2 | CAS number: 7488-55-3
- 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
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Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Validity criteria fulfilled:
- yes
- Conclusions:
- Tin(II) can be hydrolysed into SnOH^{+}, Sn(OH)_{2} and Sn(OH)^{-}_{3}. In The pH frame according the guideline most of the Sn(II) exists as
Sn(OH)_{2}. The equilibrium constant for the dissioziation logK = 7.8 +/- 0.2 (@20°C).
Martyak reports for the hydrolysis reaction of stannos sulfate a free energy of %DELTA G = -7.37 kcal/mol and a equilibrium constant of ~1.8 x 10^5.
So the stannous sulfate ist not stable in water. Under alkaline conditions (pH>8 ) changes immediately oxidation state 2 to 4.
Reference
Sédy et al. pointed out that in the most studies to high concentrations of tin were used and so polytin complexes were formed. Further Sédy et al. show that there is a different in the species formed in a solution with and without halogeninde.
The values measured under standard conditions (25°C, 1bar)
Chemical equilibrium |
-log^{m}K° |
I (mol L^{-}) |
Remark |
Sn^{2+} + H_{2}O <=> SnOH^{+} + H^{+} |
3.8 +/- 0.2 |
0.1, 0.5, 1.0 |
Inorganic tin hydrolysis |
Sn^{2+} + 2H_{2}O <=> Sn(OH)^{0}_{2} + 2H^{+} |
7.8 +/- 0.2 |
0.1, 0.5, 1.0 |
Inorganic tin hydrolysis |
Sn^{2+} +3H_{2}O <=> SnOH^{-}_{3} + 3H^{+} |
-17.5 +/- 0.2 |
0.1, 0.5, 1.0 |
Inorganic tin hydrolysis |
Sn(OH)_{2}(s)óSn^{2+} + OH^{-} |
25.80 |
0_{corr} |
Precipitation Reactions |
SnO(s) + H_{2}O <=> Sn^{2+} + OH^{-} |
26.24 |
0_{corr} |
Precipitation Reactions |
The ion interaction coefficients are:
%epsilon |
Value (L mol^{-1} |
Sn^{2+}, NO_{3}^{-} |
0.4 +/- 0.1 |
SnOH^{+}, NO_{3}^{-} |
0.2 +/- 0.1 |
Sn(OH)_{2}, NO_{3}^{-} |
0.3 +/- 0.1 |
H^{+}, NO_{3}^{-} |
0.07 +/- 0.01 |
Distribution of various species of tin (II) as a function of pH
|
Sn^{2+} / % |
Sn(OH)^{+} / % |
Sn(OH)_{2} / % |
Sn(OH)_{3}^{-} / % |
4.0 |
30 |
40 |
30 |
0 |
4.5 |
7 |
34 |
59 |
0 |
5.0 |
2 |
11 |
87 |
0 |
5.5 |
0 |
4 |
96 |
0 |
6.0 |
0 |
2 |
98 |
0 |
6.5 |
0 |
1 |
99 |
0 |
7.0 |
0 |
0 |
100 |
0 |
7.5 |
0 |
0 |
99 |
1 |
8.0 |
0 |
0 |
98 |
2 |
8.5 |
0 |
0 |
95 |
5 |
9.0 |
0 |
0 |
80 |
20 |
9.5 |
0 |
0 |
50 |
50 |
10.0 |
0 |
0 |
30 |
70 |
Distribution of various species of tin (II) as a function of pH in present of 10^{-2} mol L^{-} [Cl^{-}]
|
Sn^{2+} / % |
SnCl^{+} / % |
SnCl_{2} / % |
Sn(OH)^{+} / % |
Sn(OH)_{2} / % |
Sn(OH)_{3}^{-} / % |
4.0 |
27 |
10 |
1 |
35 |
27 |
0 |
4.5 |
8 |
3 |
0 |
29 |
60 |
0 |
5.0 |
0 |
0 |
0 |
15 |
85 |
0 |
5.5 |
0 |
0 |
0 |
5 |
95 |
0 |
6.0 |
0 |
0 |
0 |
3 |
97 |
0 |
6.5 |
0 |
0 |
0 |
1 |
99 |
0 |
7.0 |
0 |
0 |
0 |
0 |
100 |
0 |
7.5 |
0 |
0 |
0 |
0 |
99 |
1 |
8.0 |
0 |
0 |
0 |
0 |
98 |
2 |
8.5 |
0 |
0 |
0 |
0 |
95 |
5 |
9.0 |
0 |
0 |
0 |
0 |
80 |
20 |
9.5 |
0 |
0 |
0 |
0 |
50 |
50 |
10.0 |
0 |
0 |
0 |
0 |
30 |
30 |
recovery of data: 95%
Martyak reports for the hydrolysis reaction of stannos sulfate a free energy of %DELTA G = -7.37 kcal/mol and a equilibrium constant of ~1.8 x 10^5.
Description of key information
There are no proprietary studies investigating the hydrolysis of the substance in aqueous media. The substance of interest is an inorganic element.
Typically salts (ionic bonding) are electrovalent substance. Electrovalent substances are made up of ions in the solid state. The oppositely charged ions are held together by strong electrostatic (coulombic) force of attraction. Due to these forces the ions cannot move. When these substances are dissolved in water, the ions free themselves from this binding. Thus the break up of an electrovalent compound into free mobile ions when dissolved in water or when melted, is called electrolytic dissociation. In the liquid state the ions become free and mobile. But the oppositely charged ions always remain in close proximity of each other.
SnSO4(s) ---> Sn2+(aq) + SO42- (aq). This is a 100% dissociation.
In addition this dissociation behaviour is depended from the solubulity of the substance and environmental conditions. Tin(II) can be hydrolysed into SnOH+, Sn(OH)2 and Sn(OH)3-, based on the conditions. At environmental relevant pH-values the Sn(OH)2 species is the predominant one (Séby, 2001). Consequently it is not technically possible to perform testing to measure simple dissociation events so testing is waived.
Key value for chemical safety assessment
Additional information
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.
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