Water in ICE tables

Moderators: Chem_Mod, Chem_Admin

705170809
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am
Been upvoted: 1 time

Water in ICE tables

Postby 705170809 » Sun Jan 20, 2019 8:04 pm

Why do we omit water in the ICE tables?

megansardina2G
Posts: 61
Joined: Fri Sep 28, 2018 12:23 am
Been upvoted: 2 times

Re: Water in ICE tables

Postby megansardina2G » Sun Jan 20, 2019 8:07 pm

Water is a liquid, which is a pure substance (along with solids); you cannot increase or decrease its concentration. Therefore, liquids are omitted when dealing with equilibrium constants.

405021651
Posts: 46
Joined: Tue Nov 14, 2017 3:03 am

Re: Water in ICE tables

Postby 405021651 » Sun Jan 20, 2019 8:10 pm

because it is a pure liquid!!!!

Celeste 1I
Posts: 44
Joined: Fri Sep 28, 2018 12:18 am

Re: Water in ICE tables

Postby Celeste 1I » Sun Jan 20, 2019 8:15 pm

It would be on both sides of the equation and would just cancel out in the equilibrium equation. So it doesn't effect K.

Mercan Bayazit 4E
Posts: 18
Joined: Fri Sep 28, 2018 12:20 am

Re: Water in ICE tables

Postby Mercan Bayazit 4E » Sun Jan 20, 2019 9:30 pm

Because unlike the other molecules in the reactions we see, water is a pure liquid and we therefore omit it in the ICE tables.

Alma Flores 1D
Posts: 64
Joined: Wed Nov 08, 2017 3:01 am

Re: Water in ICE tables

Postby Alma Flores 1D » Sun Jan 20, 2019 10:30 pm

The concentration of a pure substance does not change in a reaction! Therefore solids and liquids are not included in K expression.

Tony Ong 3K
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Water in ICE tables

Postby Tony Ong 3K » Sun Jan 20, 2019 10:36 pm

Moreso on that, think of water, or any other forms of pure liquids, as solvents. Usually, solvents are larger in concentration than its solute constituents. Therefore, even during equilibrium the relative concentration of solvents remain the same.

Mona El Masri 1F
Posts: 34
Joined: Fri Sep 28, 2018 12:20 am

Re: Water in ICE tables

Postby Mona El Masri 1F » Mon Jan 21, 2019 12:55 pm

Water is a pure substance and a solvent. The concentration won't change and it'll cancel out on both sides so theres no point in including it in an ice table or a Ka/Kb calculation.

George Ghaly 2L
Posts: 66
Joined: Fri Sep 28, 2018 12:29 am
Been upvoted: 1 time

Re: Water in ICE tables

Postby George Ghaly 2L » Mon Jan 21, 2019 2:42 pm

Since water is a pour solvent in can be left out of the ice table when calculating equilibrium concentrations since it is in excess.

Rehan Chinoy 1K
Posts: 67
Joined: Fri Sep 28, 2018 12:25 am

Re: Water in ICE tables

Postby Rehan Chinoy 1K » Mon Jan 21, 2019 5:12 pm

Pure substances (solids, liquids) such as water do not affect the equilibrium expression.

Yiting_Gong_4L
Posts: 69
Joined: Fri Sep 28, 2018 12:25 am

Re: Water in ICE tables

Postby Yiting_Gong_4L » Mon Jan 21, 2019 8:12 pm

water is omitted because it is a liquid. solids and liquids do not affect the equilibrium.


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 2 guests