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EC number: 206-108-6 | CAS number: 301-10-0
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Surface tension
Administrative data
Link to relevant study record(s)
Description of key information
The surface tension of the dissociation/hydrolysis products of Tin bis(2-ethylhexanoate) at 1% wt. in water is 55.9 mN/m at 20.5 °C
Key value for chemical safety assessment
- Surface tension:
- 55.9
- in mN/m at 20°C and concentration in mg/L:
- 1
Additional information
The surface tension of Tin bis(2-ethylhexanoate) and its dissociation/hydrolysis products in water were determined using the OECD Guideline 115 (ring method). Tin bis(2-ethylhexanoate) is a salt which dissociates upon introduction to water. At pH > 6.8, the Sn(II) cation is reported to initially form Sn(OH)2, which is spontaneously oxidized (in oxygenated water) to form the insoluble solid Sn(IV)O2. The pKa for the 2-ethyl hexanoic acid anion is 4.8, and therefore exists primarily as the anionic species at pH > 6.8. The results of this study are expected to reflect the surface-active properties of the water-soluble dissociation products of Tin bis(2-ethylhexanoate) (i.e.,2 -ethylhexanoic acid). This substance, having a hydrophylic carboxylate group and hydrophobic C7 hydrocarbon tail, is expected to exhibit surface-active properties, as evidenced in the results of this study. The reported surface tension of an approximately 0.1% wt. solution of the dissociation products of tin bis(2-ethylhexanoate) is 55.9 mN/m at 20.5 °C
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