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Surface tension

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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