November 24, 2024, 10:35:22 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Why can't aluminum react with HNO3?  (Read 14600 times)

0 Members and 1 Guest are viewing this topic.

Offline kimi85

  • Full Member
  • ****
  • Posts: 133
  • Mole Snacks: +0/-12
Why can't aluminum react with HNO3?
« on: July 22, 2007, 01:25:19 AM »
Why can't aluminum react with HNO3?

Is it because aluminum can form hydrates? Thanks!
« Last Edit: July 23, 2007, 02:15:42 AM by Mitch »
Logged

Offline enahs

  • 16-92-15-68 32-7-53-92-16
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 2179
  • Mole Snacks: +206/-44
  • Gender: Male
Re: Aluminum
« Reply #1 on: July 22, 2007, 11:26:55 AM »
Aluminum is highly reactive with air. It forms a fairly chemically inert protective coating around the aluminum metal that is exposed to air. What is this coating and write the balanced chemical equations for Al + O2 -> ?.
Logged

Offline kimi85

  • Full Member
  • ****
  • Posts: 133
  • Mole Snacks: +0/-12
Re: Aluminum
« Reply #2 on: July 22, 2007, 11:05:17 PM »

4Al   +  3O2  --> 2Al2O3
Logged

Offline kimi85

  • Full Member
  • ****
  • Posts: 133
  • Mole Snacks: +0/-12
Re: Aluminum
« Reply #3 on: July 22, 2007, 11:06:49 PM »
thanks..so, aluminum oxide is the coating? and is the reason why aluminum cant react with nitric acid?
Logged

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7976
  • Mole Snacks: +555/-93
  • Gender: Male
Re: Why can't aluminum react with HNO3?
« Reply #4 on: July 23, 2007, 02:21:15 AM »
Aluminium reacts with diluted HNO3. When concentrated HNO3 is use passivation occurs, ie HNO3 oxidizes surface of Al to Al2O3 which in turn is insoluble in concentrated HNO3.
Logged
AWK

Offline kimi85

  • Full Member
  • ****
  • Posts: 133
  • Mole Snacks: +0/-12
Re: Why can't aluminum react with HNO3?
« Reply #5 on: July 23, 2007, 03:55:00 AM »
thank you very much!  ;D
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links