When to use ICE box

Moderators: Chem_Mod, Chem_Admin

Kiana Javier 3G
Posts: 77
Joined: Wed Sep 30, 2020 10:11 pm

When to use ICE box

Postby Kiana Javier 3G » Sun Jan 24, 2021 9:03 pm

Hello! When do we specifically know when to use the ICE box when solving for equilibrium concentrations? And is the term "equilibrium composition" another way of saying equilibrium concentrations?

Joseph Hsing 2C
Posts: 85
Joined: Wed Sep 30, 2020 9:42 pm

Re: When to use ICE box

Postby Joseph Hsing 2C » Sun Jan 24, 2021 9:27 pm

We use ICE box to find unknown concentrations at equilibrium or initial given the concentration of one of the reactants or products. And yes finding equilibrium composition means the same as finding equilibrium concentrations.

Mina Tadros 3L
Posts: 88
Joined: Wed Sep 30, 2020 9:38 pm

Re: When to use ICE box

Postby Mina Tadros 3L » Sun Jan 24, 2021 9:30 pm

You would use the ICE box when you are given an initial concentration of a weak acid or base, and you are trying to calculate the equilibrium concentration of both the products and the reactants.

Ryan Hoang 1D
Posts: 95
Joined: Wed Sep 30, 2020 9:49 pm

Re: When to use ICE box

Postby Ryan Hoang 1D » Sun Jan 24, 2021 9:42 pm

You wouldn't use ICE when you are given all the concentrations AT equilibrium (in which case you'd just be able to calculate K easily). But, if you don't know the values at equilibrium and are only given initial values, you'd have to use ICE.

AndrewNguyen_2H
Posts: 85
Joined: Wed Sep 30, 2020 9:59 pm

Re: When to use ICE box

Postby AndrewNguyen_2H » Sun Jan 24, 2021 9:44 pm

You use ICE box to organize the information you have. If they give you an initial concentration you can represent missing variables with x and make this equal to the equilibrium constant.

Blake Ballew 1H
Posts: 85
Joined: Wed Sep 30, 2020 9:35 pm

Re: When to use ICE box

Postby Blake Ballew 1H » Sun Jan 24, 2021 9:47 pm

Its usually most common when they are asking for something outside of the Kc i.e the Qc. The value of x after all is the amount of change between these two values.

Rachael Cohen 3G
Posts: 11
Joined: Sun Dec 13, 2020 12:17 am

Re: When to use ICE box

Postby Rachael Cohen 3G » Sun Jan 24, 2021 9:50 pm

I find that ICE charts are always useful for problems that give you any concentrations. They're a great way to organize the information you have. Sometimes you might not actually need one, but I think they help conceptualize the information you're given.

Lauren Sarigumba 1K
Posts: 86
Joined: Wed Sep 30, 2020 9:41 pm

Re: When to use ICE box

Postby Lauren Sarigumba 1K » Sun Jan 24, 2021 9:56 pm

Equilibrium composition is just another way of saying equilibrium concentrations. You have to use ICE Box when the initial concentrations are given and you have to solve for equilibrium concentrations or vice versa.

Charmaine Ng 2D
Posts: 92
Joined: Wed Sep 30, 2020 9:37 pm

Re: When to use ICE box

Postby Charmaine Ng 2D » Sun Jan 24, 2021 9:59 pm

You use ICE box whenever you're given an initial concentration and need to know the concentrations at equilibrium. You can also use it backwards if given a pH, and want to find the initial concentrations! :))

Jose Miguel Conste 3H
Posts: 80
Joined: Sat Oct 03, 2020 12:15 am

Re: When to use ICE box

Postby Jose Miguel Conste 3H » Sun Jan 24, 2021 10:14 pm

Use ICE box when you need to find concentrations, or when you're given initial or final concentration. and yes it is

Armen_Isayan_2L
Posts: 96
Joined: Wed Sep 30, 2020 10:09 pm

Re: When to use ICE box

Postby Armen_Isayan_2L » Sun Jan 24, 2021 10:26 pm

Hello! We use the ICE box when we are solving for the equilibrium concentration of both products and reactants and attempting to track the change that took place from the initial concentration. Most of the time the initial concentration is provided in the question and that is when we'd have to use the ICE box to further solve for the concentrations.

emwoodc
Posts: 81
Joined: Fri Aug 09, 2019 12:16 am

Re: When to use ICE box

Postby emwoodc » Sun Jan 24, 2021 10:54 pm

We use ICE boxes when we have an unknown concentration!

John Antowan 1K
Posts: 59
Joined: Thu Dec 17, 2020 12:19 am

Re: When to use ICE box

Postby John Antowan 1K » Sun Jan 24, 2021 10:55 pm

ICE boxes are usually used to find any unknown concentration and is vital for calculating numbers like pOH and pH depending on the nature of the question.

Kiana Javier 3G
Posts: 77
Joined: Wed Sep 30, 2020 10:11 pm

Re: When to use ICE box

Postby Kiana Javier 3G » Sun Jan 24, 2021 10:56 pm

Ryan Hoang 1D wrote:You wouldn't use ICE when you are given all the concentrations AT equilibrium (in which case you'd just be able to calculate K easily). But, if you don't know the values at equilibrium and are only given initial values, you'd have to use ICE.


This was where I was getting confused when going over the textbook problems, I wasn't paying attention to the fact that the concentrations weren't at equilibrium. I just need to be more careful, thank you!

Brianna Martilla 1C
Posts: 103
Joined: Wed Sep 30, 2020 9:58 pm

Re: When to use ICE box

Postby Brianna Martilla 1C » Sun Jan 24, 2021 10:57 pm

You use the ICE box when being asked to find the equilibrium concentration. I think a good way to approach a problem is to see what you are given and what you already know or can determine, and then see what would apply to solve the question.

RylanPurificacion 3J
Posts: 36
Joined: Mon Jan 04, 2021 12:09 pm

Re: When to use ICE box

Postby RylanPurificacion 3J » Sun Jan 24, 2021 11:00 pm

It's also worth noting that ICE boxes can be used to solve equilibrium problems involving pressure as well, not just concentration. One of the problems in the previous Sapling HWs had that.

Griffin G
Posts: 84
Joined: Wed Sep 30, 2020 9:50 pm

Re: When to use ICE box

Postby Griffin G » Sun Jan 24, 2021 11:07 pm

Use the ICE box whenever you're trying to figure out how concentrations change before and after a reaction reaches equilibrium, basically.

DominicMalilay 1F
Posts: 99
Joined: Wed Sep 30, 2020 9:36 pm

Re: When to use ICE box

Postby DominicMalilay 1F » Sun Jan 24, 2021 11:13 pm

I use ice box when I need to find concentrations of the molecules because you set up a quadratic or algebraic problem to solve for your concentration. You need to know the K value!

joshtully
Posts: 87
Joined: Wed Sep 30, 2020 9:36 pm

Re: When to use ICE box

Postby joshtully » Sun Jan 24, 2021 11:35 pm

Use ICE boxes to find unknown concentrations when given the concentration of another substances.

Chinmayi Mutyala 3H
Posts: 90
Joined: Wed Sep 30, 2020 9:50 pm

Re: When to use ICE box

Postby Chinmayi Mutyala 3H » Sun Jan 24, 2021 11:36 pm

Yes, equilibrium composition means equilibrium concentrations. You use the ICE box when you are given initial concentrations and you need to find K or the equilibrium concentrations.

305572629
Posts: 86
Joined: Wed Sep 30, 2020 9:41 pm

Re: When to use ICE box

Postby 305572629 » Sun Jan 24, 2021 11:38 pm

Use when given info on a weak acid or base to compare initial and final concentrations.

Sejal Parsi 3K
Posts: 76
Joined: Wed Sep 30, 2020 10:03 pm

Re: When to use ICE box

Postby Sejal Parsi 3K » Sun Jan 24, 2021 11:40 pm

ICE boxes are used to find unknown concentrations at equilibrium or initial ones when given the concentration of reactants or products. Finding equilibrium composition means the same as finding equilibrium concentrations.

LeahSWM 2E
Posts: 71
Joined: Wed Sep 30, 2020 9:47 pm

Re: When to use ICE box

Postby LeahSWM 2E » Sun Jan 24, 2021 11:41 pm

ICE box is used to find an unknown concentration.

Annette Fishman
Posts: 92
Joined: Wed Sep 30, 2020 10:03 pm
Been upvoted: 1 time

Re: When to use ICE box

Postby Annette Fishman » Mon Jan 25, 2021 9:25 am

The ICE box is used to find unknown concentrations at equilibrium or initial given the concentration of one of the reactants or products.


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 1 guest