Metal ions in aqueous solutions are solvated, or hydrated, by water molecules. Typically this primary hydration sphere is composed of six water molecules. The hydrated metal ion acts as a weak acid, undergoing a stepwise hydrolysis in which it donates an H* ion from its water ligands to the surrounding free water molecules. Shown is the hydrolysis of Al(H,O)+ (pKa = 4.85) in water. Al(H, O);*(aq) + H,01) = H;0*(aq) + Al(H, O),OH²+(aq) Calculate the pH of a 0.00151 M AICI, solution and determine what fraction of the aluminum is in the form Al(H,O),OH?+ pH = dAI(H, O), (OH)*

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Metal ions in aqueous solutions are solvated, or hydrated, by water molecules. Typically this primary hydration sphere is
composed of six water molecules. The hydrated metal ion acts as a weak acid, undergoing a stepwise hydrolysis in which it
donates an H* ion from its water ligands to the surrounding free water molecules. Shown is the hydrolysis of Al(H,O);+
(pKa = 4.85) in water.
Al(H, O);*(aq) + H,01) = H;0*(aq) + Al(H, O),OH²+(aq)
Calculate the pH of a 0.00151 M AICI, solution and determine what fraction of the aluminum is in the form Al(H,O),OH²+.
pH =
"AICH,O), (OH)²+
Transcribed Image Text:Metal ions in aqueous solutions are solvated, or hydrated, by water molecules. Typically this primary hydration sphere is composed of six water molecules. The hydrated metal ion acts as a weak acid, undergoing a stepwise hydrolysis in which it donates an H* ion from its water ligands to the surrounding free water molecules. Shown is the hydrolysis of Al(H,O);+ (pKa = 4.85) in water. Al(H, O);*(aq) + H,01) = H;0*(aq) + Al(H, O),OH²+(aq) Calculate the pH of a 0.00151 M AICI, solution and determine what fraction of the aluminum is in the form Al(H,O),OH²+. pH = "AICH,O), (OH)²+
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