Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1]   Go Down

Author Topic: How does this reaction work? (Ammonia with Silver)  (Read 39089 times)

0 Members and 1 Guest are viewing this topic.

VenDiddy

  • Guest
How does this reaction work? (Ammonia with Silver)
« on: May 09, 2005, 01:24:14 PM »

Question:
Excess concentrated aqueous ammonia is added to solid silver chloride.

Answer:
AgCl + NH3 => Ag(NH3)2+1 + Cl-

Can someone please explain why this works?  ???
« Last Edit: May 09, 2005, 02:33:12 PM by VenDiddy »
Logged

Grumples

  • Guest
Re:How does this reaction work? (Ammonia with Silver)
« Reply #1 on: May 09, 2005, 02:19:42 PM »

By the way, I believe it forms Ag(NH3)2+1, not +2.  Sorry, but all I know is that it forms, not how.  However, I think it may have to do with the N from the NH3 (which is slightly negative) being attracted to the Ag+1 ion.
Logged

VenDiddy

  • Guest
Re:How does this reaction work? (Ammonia with Silver)
« Reply #2 on: May 09, 2005, 02:34:10 PM »

Just corrected the charge. Chemistry baffles me...
Logged

xiankai

  • Chemist
  • Full Member
  • *
  • Mole Snacks: +77/-37
  • Offline Offline
  • Gender: Male
  • Posts: 786
Re:How does this reaction work? (Ammonia with Silver)
« Reply #3 on: May 10, 2005, 12:05:14 AM »

i also asked a similar question last time, its just that  it forms a complex salt . as for why it forms a complex salt... well maybe ammonia could be more concentrated and hence displaces chlorine and forms the unstable salt with silver... just my thoughts
Logged
one learns best by teaching

AWK

  • Retired Staff
  • Sr. Member
  • *
  • Mole Snacks: +448/-78
  • Offline Offline
  • Gender: Male
  • Posts: 6247
Re:How does this reaction work? (Ammonia with Silver)
« Reply #4 on: May 10, 2005, 01:58:10 AM »

Quote
and hence displaces chlorine and forms the unstable salt with silver... just my thoughts
Silver cholride itself is insoluble in water, though is ionic in solid state.
After addition of ammnia complex Ag+ forms complex cation Ag(NH3)2+i and this new compund
Ag(NH3)2+Cl- is soluble in water.
Logged
AWK

jdurg

  • Banninator
  • Retired Staff
  • Sr. Member
  • *
  • Mole Snacks: +106/-23
  • Offline Offline
  • Gender: Male
  • Posts: 1366
  • I am NOT a freak.
Re:How does this reaction work? (Ammonia with Silver)
« Reply #5 on: May 10, 2005, 11:22:32 AM »

AgCl is VERY slightly solube in water (But it's such a small solubility number that we basically just say 'it's insoluble').  So by removing the Ag+ ions from the water, you shift the equillibrium which allows more AgCl to dissolve, so more Ag+ is formed which is then eaten up again, etc. etc.
Logged
"A real fart is beefy, has a density greater than or equal to the air surrounding it, consists

Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Mole Snacks: +260/-12
  • Offline Offline
  • Gender: Male
  • Posts: 3178
    • New Asia Republic
Re:How does this reaction work? (Ammonia with Silver)
« Reply #6 on: May 10, 2005, 06:05:03 PM »

1. AgCl (s) <-> Ag+ (aq) + Cl- (aq)

2. Ag+ + 2NH3 <-> Ag(NH3)2+

equilibirum 2 has a very high Kstability constant. effectively, adding concentrated ammonia removes Ag+ in solution because Ag+ is converted to another form. This favours the forward reaction (Le Chatelier's Principle) of Equlibrium 1. The net effect is AgCl exhibits higher solubility in concentrated ammonia.
Logged
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006
Pages: [1]   Go Up
 

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.053 seconds with 23 queries.