March 28, 2024, 06:59:53 PM
Forum Rules: Read This Before Posting


Topic: Equilibrium law in chemical reactions  (Read 8327 times)

0 Members and 1 Guest are viewing this topic.

777888

  • Guest
Equilibrium law in chemical reactions
« on: November 20, 2004, 06:18:20 PM »
Hi, I have some questions:

1)What is the Law of Mass Action"?

2)What is the realationship known as "Equilibrium Law"?

[Is there a difference between question 1 and 2? They seem like the same question...]

3)Write the law of mass action for the reaction: H2 + I2 = 2HI
[What is this trying to ask? Is the answer a number? How can I write this law?]
« Last Edit: November 20, 2004, 06:26:04 PM by 777888 »

ssssss

  • Guest
Re:Equilibrium law in chemical reactions
« Reply #1 on: November 21, 2004, 02:11:21 AM »
Hi, I have some questions:

1)What is the Law of Mass Action"?

2)What is the realationship known as "Equilibrium Law"?

[Is there a difference between question 1 and 2? They seem like the same question...]

3)Write the law of mass action for the reaction: H2 + I2 = 2HI
[What is this trying to ask? Is the answer a number? How can I write this law?]


You are asking questions as you dont have a chemistry Book.These are basic principles given in your book in chapter on Chemical Equilibrium.Read it thoroughly.Then if you find any queries,Ask.

777888

  • Guest
Re:Equilibrium law in chemical reactions
« Reply #2 on: November 21, 2004, 02:15:56 AM »
...
Sorry, I read it but the textbook put law of mass action and equilibrium in the same place! I don't know if the law of mass action means the equation...

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:Equilibrium law in chemical reactions
« Reply #3 on: November 21, 2004, 08:32:50 AM »
aA + bB -> cC + dD

Law of Mass Action tells you that [C]c[D]d/[A]ab = constant only if the the above reaction is at  chemical equilibrium, ie.

aA + bB <-> cC + dD

The equilibrium law is a specific form of the law of mass action. The equilibrium law tells you that for a chemical system at equilibrium, its equilibirum constant can be computed as [C]c[D]d/[A]ab. Law of Mass Action confirms that this value is indeed a constant.
"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

777888

  • Guest
Re:Equilibrium law in chemical reactions
« Reply #4 on: November 22, 2004, 01:06:16 AM »
I am OK with this question now...we treat law of mass action and equilibrium law as the same thing
« Last Edit: November 22, 2004, 10:10:24 AM by 777888 »

777888

  • Guest
Re:Equilibrium law in chemical reactions
« Reply #5 on: November 22, 2004, 10:12:04 AM »
I have another question!

Are all / most reactions equilbrium reactions? Is there a case that is not a equilibrium reaction?

Offline jdurg

  • Banninator
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1366
  • Mole Snacks: +106/-23
  • Gender: Male
  • I am NOT a freak.
Re:Equilibrium law in chemical reactions
« Reply #6 on: November 22, 2004, 10:53:57 AM »
I have another question!

Are all / most reactions equilbrium reactions? Is there a case that is not a equilibrium reaction?

ALL reactions are equillibrium reactions.  Every single one of them.  It's just that for some reactions the equillibrium is favored towards the products so heavily that we say they are essentially all "forward reactions".  (Such as the combustion of oxygen and hydrogen.  The equillibrium constant favors the formation of water so much that we can disregard the infentesimally small handful of water molecules which decompose back into hydrogen and oxygen).
"A real fart is beefy, has a density greater than or equal to the air surrounding it, consists

777888

  • Guest
Re:Equilibrium law in chemical reactions
« Reply #7 on: November 22, 2004, 12:38:21 PM »
Thanks a lot~

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re:Equilibrium law in chemical reactions
« Reply #8 on: November 22, 2004, 02:06:30 PM »
All reactions are equilibrium reactions except those that are thermodynamically/photochemically forbidden of course.
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Sponsored Links