When some sodium hydroxide is gradually added to a solution of lead nitrate Pb(NO3)2 at 0.01 mol.L-¹, lead hydroxide Pb(OH)2 starts to precipitate at pH of 7.5; Calculate the solubility product of Pb(OH)2. What is the solubility of lead hydroxide in water? What would be the concentration of Pb2+ if the pH of the initial solution was fixed to 9?

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When some sodium hydroxide is gradually added to a solution of lead nitrate Pb(NO3)2 at 0.01
mol.L-¹, lead hydroxide Pb(OH)2 starts to precipitate at pH of 7.5; Calculate the solubility
product of Pb(OH)2. What is the solubility of lead hydroxide in water? What would be the
concentration of Pb²+ if the pH of the initial solution was fixed to 9?
The answer :
1) Ks 10-¹5 ;2) 6.3×10-6 mol.L-¹; 3) [Pb²+] = 10–5 mol.L-¹
Transcribed Image Text:When some sodium hydroxide is gradually added to a solution of lead nitrate Pb(NO3)2 at 0.01 mol.L-¹, lead hydroxide Pb(OH)2 starts to precipitate at pH of 7.5; Calculate the solubility product of Pb(OH)2. What is the solubility of lead hydroxide in water? What would be the concentration of Pb²+ if the pH of the initial solution was fixed to 9? The answer : 1) Ks 10-¹5 ;2) 6.3×10-6 mol.L-¹; 3) [Pb²+] = 10–5 mol.L-¹
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