Moles vs Concentrations in ICE Box

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Connie Liang 3L
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Moles vs Concentrations in ICE Box

Postby Connie Liang 3L » Mon Jan 18, 2021 1:16 pm

When doing the ICE box, is it your habit to put in moles or concentrations in? Is there a certain reason why you would choose one over the other?

Samantha Pedersen 2K
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Re: Moles vs Concentrations in ICE Box

Postby Samantha Pedersen 2K » Mon Jan 18, 2021 1:18 pm

My habit is putting the concentrations of each species into the ICE box. I like to use concentrations rather than moles so that I don't have to remember to do an extra step at the end of converting moles into concentrations.

Madison Wong 3H
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Re: Moles vs Concentrations in ICE Box

Postby Madison Wong 3H » Mon Jan 18, 2021 1:53 pm

I use moles, because it makes it easier when writing it in the Ka equation to use molarity rather than moles as there is an extra step of considering volume that is missing.

SahajDole_1C
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Re: Moles vs Concentrations in ICE Box

Postby SahajDole_1C » Mon Jan 18, 2021 2:00 pm

I use the molar concentration as it makes it easier in the end

Olivia Monroy 1A
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Re: Moles vs Concentrations in ICE Box

Postby Olivia Monroy 1A » Mon Jan 18, 2021 2:20 pm

I use molarity/molar concentration to keep the ice box as simple as possible and ICE does stand for initial concentration*, change in concentration*, and equilibrium concentration*

Maaria Abdel-Moneim 2G
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Re: Moles vs Concentrations in ICE Box

Postby Maaria Abdel-Moneim 2G » Mon Jan 18, 2021 2:40 pm

Using molar concentrations makes things more consistent especially if you are using or solving for the K value which uses molar concentrations in its equation.

Minh-Thy Vo 3D
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Re: Moles vs Concentrations in ICE Box

Postby Minh-Thy Vo 3D » Mon Jan 18, 2021 3:58 pm

I usually use molar concentration just so I don't forget to do the conversion at the end.

Laura 3l
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Re: Moles vs Concentrations in ICE Box

Postby Laura 3l » Mon Jan 18, 2021 4:16 pm

I think it's just easier to put in Moles in the beginning when doing an ICE Box, just so you don't forget to convert the concentrations in the end.

Faaizah Arshad 1H
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Re: Moles vs Concentrations in ICE Box

Postby Faaizah Arshad 1H » Mon Jan 18, 2021 7:36 pm

When I use the ice table, I normally start with concentrations because I can directly calculate the equilibrium concentrations and plug them into the K expression to solve a problem. However, if you use moles, then you have to make sure to convert to concentrations later on, which you could possibly forget to do. Therefore, I think it's safer and more helpful to use concentrations.

Cecilia Cisneros 1F
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Re: Moles vs Concentrations in ICE Box

Postby Cecilia Cisneros 1F » Mon Jan 18, 2021 7:43 pm

I tend to just use concentrations because it makes it much easier to be able to solve for equilibrium constants. I would say that is the safer bet (to use concentrations over moles) because there is a chance that you may forget to convert moles to concentration when finding equilibrium constants.

John_Tran_3J
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Re: Moles vs Concentrations in ICE Box

Postby John_Tran_3J » Mon Jan 18, 2021 7:47 pm

I use molar concentration, it is the most simple in the end.

Giselle_zamora_1L
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Re: Moles vs Concentrations in ICE Box

Postby Giselle_zamora_1L » Mon Jan 18, 2021 10:44 pm

I convert it to moles in the beginning but i think that would only be for Kc because since K is unitless when calculating Kp (pressure) i don't think it matter if you do bar or atm

magalysantos_1F
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Re: Moles vs Concentrations in ICE Box

Postby magalysantos_1F » Tue Jan 19, 2021 12:13 am

It really depends on the type of problem. If you are given the moles and volume of an reactant or products, I use the concentration since its usually the initial concentration needed for ICE Box calculations. However, if I am already given at least one concentration at equilibrium for a reactant or product, I solve the ICE Box first and then divide every final concentration by the volume.

Sejal Parsi 3K
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Re: Moles vs Concentrations in ICE Box

Postby Sejal Parsi 3K » Tue Jan 19, 2021 1:22 am

I normally use molar concentration because it keeps everything consistent and saves a step at the end.

Jasmin Kumar 1G
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Re: Moles vs Concentrations in ICE Box

Postby Jasmin Kumar 1G » Tue Jan 19, 2021 9:40 am

I normally do molar concentrations because it easier to have the final answer at the end, rather than having to divide by the liters at the end because I would probably forget.

Madeline Ogden 3B
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Re: Moles vs Concentrations in ICE Box

Postby Madeline Ogden 3B » Tue Jan 19, 2021 12:40 pm

I typically put concentrations in my ICE boxes. This allows me to do the conversion from moles to concentration at the beginning of the problem rather than the end so I don't forget to do it.

Keeryth Sandhu 1H
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Re: Moles vs Concentrations in ICE Box

Postby Keeryth Sandhu 1H » Tue Jan 19, 2021 12:52 pm

I tend to put concentrations in, especially if solving for the K value.

Jiwon_Chae_3L
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Re: Moles vs Concentrations in ICE Box

Postby Jiwon_Chae_3L » Tue Jan 19, 2021 1:02 pm

I prefer using concentrations in the ICE box as I find that most questions end up asking for concentration values anyways.

Serena Song 1A
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Re: Moles vs Concentrations in ICE Box

Postby Serena Song 1A » Tue Jan 19, 2021 4:03 pm

I prefer putting the concentrations into the ice box just so that I don't forget to it later on.

Karl Yost 1L
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Re: Moles vs Concentrations in ICE Box

Postby Karl Yost 1L » Tue Jan 19, 2021 4:15 pm

Always use concentrations, as it is less work. When the reaction vessel is not 1L, you will have to do some more work to convert the provided concentrations to the amount of moles. Also, we are measuring changes in concentration, so using concentrations is more applicable.

Mary Gallo 1G
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Re: Moles vs Concentrations in ICE Box

Postby Mary Gallo 1G » Tue Jan 19, 2021 4:25 pm

I would suggest using concentrations in ICE boxes because we use concentrations when working with K values, pH and pOH, or compositions of solutions.

RyanKopeikin_2I
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Re: Moles vs Concentrations in ICE Box

Postby RyanKopeikin_2I » Tue Jan 19, 2021 5:01 pm

I would strongly recommend putting concentrations in the ICE box, even though I know Sappling often uses moles. Using concentrations reduces the amount of steps you will need to do later, and decreases the likelihood you will make an error like forget to convert moles to molarity.


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