The adsorption of cobalt on silica surfaces is a function of the ionic state of the...

 

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The adsorption of cobalt on silica surfaces is a function of the ionic state of the cobalt (formation of hydroxocobalt(II) complexes). The following cobalt complexation. reactions are known to occur in natural systems: Co+20H CO(OH)3(s) Co(OH) + HCo+ +HO Co(OH); +H* Co(OH)* + HO Co(OH)Co(OH)(s) Co(OH); +H* Co(OH)2 +HO logK = 14.9 logK = 9.6 logK = 9.2 logK, = 5.7 logK = 12.7 Use this information to: a) Develop a species distribution diagram for Co+, Co(OH), Co(OH) and Co(OH), as a function of pH. b) Identify the pH ranges in which the various cobalt complexes and free cobalt ion predominate. The adsorption of cobalt on silica surfaces is a function of the ionic state of the cobalt (formation of hydroxocobalt(II) complexes). The following cobalt complexation. reactions are known to occur in natural systems: Co+20H CO(OH)3(s) Co(OH) + HCo+ +HO Co(OH); +H* Co(OH)* + HO Co(OH)Co(OH)(s) Co(OH); +H* Co(OH)2 +HO logK = 14.9 logK = 9.6 logK = 9.2 logK, = 5.7 logK = 12.7 Use this information to: a) Develop a species distribution diagram for Co+, Co(OH), Co(OH) and Co(OH), as a function of pH. b) Identify the pH ranges in which the various cobalt complexes and free cobalt ion predominate.

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To develop a species distribution diagram for cobalt species we need to plot the relative concentrat... View the full answer