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Topic: Why does Pt(s) dissolve in a mixture of HCl and NO3-, but not seperately?  (Read 5025 times)

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Offline billsauce

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Why does Pt(s) dissolve in a mixture of HCl and NO3-, but not seperately?
« on: May 05, 2012, 09:46:51 PM »
Explain why platinum metal dissolves in a mixture of HCl and NO3-, but not when it is in separate solutions of HCl and NO3-.

Pt2+ + 2e- ---> Pt         V = 1.188V

PtCl4 2- + 2e- ---> Pt + 4Cl-  V = .755V

NO3- + 4H+ + 3e- ---> NO + 2H2O    V = .96V
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Offline Borek

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Re: Why does Pt(s) dissolve in a mixture of HCl and NO3-, but not seperately?
« Reply #1 on: May 06, 2012, 04:48:56 AM »
Please read forum rules.

You have to show your attempts at solving the question to receive help. This is a forum policy.
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Offline billsauce

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Re: Why does Pt(s) dissolve in a mixture of HCl and NO3-, but not seperately?
« Reply #2 on: May 06, 2012, 12:59:25 PM »
well i realized that it is possible the cell voltage decreased because the PtCl4 2- complex ion was made..but then im stuck. i have no idea how to do this problem
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Offline Borek

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Re: Why does Pt(s) dissolve in a mixture of HCl and NO3-, but not seperately?
« Reply #3 on: May 06, 2012, 01:45:23 PM »
You are on the right track. You have something that oxidizes Pt and something that removes the oxidized form from the reaction mixture by complexing it.
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