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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: ricky on August 03, 2005, 12:05:31 AM

Title: which metals is resistant with Hcl?
Post by: ricky on August 03, 2005, 12:05:31 AM

Hi
I am Ricky from Surabaya, Indonesia

I have some problems to my university task .
  I want to know is there any metals that doesn't react with Hcl ?

Thank you for your kind help :)

Title: Re:which metals is resistant with Hcl?
Post by: Donaldson Tan on August 03, 2005, 12:20:34 AM

metal is definitely not organic. i'm moving this topic to general chemistry.

copper won't react with aq. HCl.

Title: Re:which metals is resistant with Hcl?
Post by: asqa on August 03, 2005, 12:24:38 AM

bilbo.chm.uri.edu/CHM112/problemsets/18-50.html - 6k http://
rhodium metal

Title: Re:which metals is resistant with Hcl?
Post by: sdekivit on August 03, 2005, 05:14:43 AM

you should check a table of standard electrode potentials. A reaction between a metal and an acid, results in a salt, containing the metalion and H2-gas in a particular redoxreaction.

--> the nobler the metal is, the harder it is to let it react with an acid. All metals above the + 0,30 V in the standard electrodepotentialtable won't react with H+, because H+ as an oxidator isn't strong enough. ( between the 0,00 V abd + 0,30 V an equilibrium will occur)

--> Copper has a standard electrode potential of + 0,34 V and thus no reaction will occur. Ag won't react either for example.

Title: Re:which metals is resistant with Hcl?
Post by: xiankai on August 03, 2005, 06:06:50 AM

the reaction with HCl and metals is sort of a displacement reaction. check out this reactivity series: http://en.wikipedia.org/wiki/Reactivity_series

since hydrogen is more reactive than the metals below it, those metals cannot displace hydrogen from its solution.

Title: Re:which metals is resistant with Hcl?
Post by: sdekivit on August 03, 2005, 06:36:45 AM

metals + acid is a typical oxidation/reduction:

Metal  --> metalion + e
2H(+) + 2e- --> H2