If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M NaOH solution. It is found that 20.0mL of NaOH are required.b.) How many moles of Co3+ does this correspond to?

Question

If you pass 10.0mL of a 50.0mL solution of [Co(en)2Cl2]Cl that has been reduced with Zn through a cation exchange column, you will obtain a solution that has three H+ ions for every Co3+ ion that was originally present in the sample. These H+ ions are titrated with 0.10-M NaOH solution. It is found that 20.0mL of NaOH are required.b.)	How many moles of Co3+ does this correspond to?

DrBob222 · Accepted Answer

...........Co^3+ ==> Co^?+ + 3H^+ I...........x........0........0 C.......... E...........0.002/3..........0.002 Wouldn't that be 0.002/3 = 0.000667 in the 10.0 mL?