The stability of hydrosulphido- and sulphido-complexes of Au(I) and Ag(I) at 25°C

Details The stability of hydrosulphido- and sulphido-complexes of Au(I) and Ag(I) at 25°C The stability of hydrosulphido- and sulphido-complexes of Au(I) and Ag(I) at 25°C

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53..245r&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 2, pp.245-253

Physics

12

Scientific paper

The solubility of Au 2 S at 25°C in aqueous H 2 S---HS - solutions were measured from pH 2 to 12 and over a range of reduced sulphur concentrations from 0.005 to 0.4 molal. The species AuHS 0 , Au(HS) 2 - and Au 2 S 2 2- were identified and thermodynamic solubility constants were derived for the reaction using a nonlinear least squares procedure: log K Au,110 =-6.68 (0.03) for AuHS 0 ; log K Au,120 = +4.52 (0.01) for Au(HS) 2 - ; and log K Au,202 =-14.63 (0.03) for Au 2 S 2 2- . The quoted uncertainty corresponds to one standard deviation. The first dissociation constant for H 2 S obtained from the Au 2 S solubility measurements was log K a1 = -6.98 (0.01). From published high temperature and pressure values of K r 120 for the reaction Au (c) +H 2 S+HS-=Au(HS) - 2 +H 2( g ) the standard partial molar volume of Au(HS) 2 - was obtained ( T °C, V 0 cm mol -1 ): 175°, -36; 200°, -25; 225°, -10; and 250°, -15. Published solubility data for Ag 2 S is solutions at I = 1.0 and 20°C have been reinterpreted to give the following thermodynamic solubility constants at infinite dilution: log K Ag, 110 = -8.94 (0.01) for AgHS 0 , log K Ag, 120 = -1.02 (0.01) for Ag(HS) 2 - ; and log K Ag, 221 = -4.44 (0.01) for Ag 2 (HS) 2 S 2- .

Affiliated with

Also associated with

No associations

Rating

The stability of hydrosulphido- and sulphido-complexes of Au(I) and Ag(I) at 25°C does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The stability of hydrosulphido- and sulphido-complexes of Au(I) and Ag(I) at 25°C, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The stability of hydrosulphido- and sulphido-complexes of Au(I) and Ag(I) at 25°C will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1884592