A wastewater from an electroplating process is at pH 2 5, due primarily to the presence of nitric acid, HNO 3 , with pKa 1 5 The solution contains 6 x 10 M TOTCu, almost all of which is present as Cut The wastewater is to be neutralized using a solution that was originally prepared as 0 2 M NaOH However, the NaOH solution has been exposed to the atmosphere for some time, and CO 2 has dissolved into it, so that TO7CO, is now 0 02 M (a) Prepare a log C pH diagram for a solution containing 0 02 M TO 7 CO, and use it to determine the pH of the NaOH solution after the CO 2 dissolves (b) Add curves to the log C pH diagram for Cut and Cu(OH),2 species for x54 Write the TOTH equation for the waste solution after 30 mL of the alkaline, neutralizing solution has been added per liter of wastewater, using dominant species as components Because this volume of titrant added is only 3 of the volume of wastewater solution, dilution of the wastewater can be ignored What is the pH of the mixture

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Question: A wastewater from an electroplating process is at pH 2.5, due primarily to the presence of nitric acid, HNO 3 , with pKa=-1.5. The solution

A wastewater from an electroplating process is at pH 2.5, due primarily to the presence of nitric acid, HNO₃, with pKa=-1.5. The solution contains 6 x 10 M TOTCu, almost all of which is present as Cut. The wastewater is to be neutralized using a solution that was originally prepared as 0.2 M NaOH. However, the NaOH solution has been exposed to the atmosphere for some time, and CO₂ has dissolved into it, so that TO7CO, is now 0.02 M.

(a) Prepare a log C-pH diagram for a solution containing 0.02 M TO₇CO, and use it to determine the pH of the NaOH solution after the CO₂ dissolves.

(b) Add curves to the log C-pH diagram for Cut and Cu(OH),2-* species for x54. Write the TOTH equation for the waste solution after 30 mL of the alkaline, neutralizing solution has been added per liter of wastewater, using dominant species as components. Because this volume of titrant added is only 3% of the volume of wastewater solution, dilution of the wastewater can be ignored. What is the pH of the mixture?

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