ICE


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jlinwashington1B
Posts: 65
Joined: Fri Sep 28, 2018 12:22 am

ICE

Postby jlinwashington1B » Mon Mar 11, 2019 10:21 am

f the value of K is less than 10^-3, what can we assume about the value ?

Timothy_Yueh_4L
Posts: 57
Joined: Fri Sep 28, 2018 12:28 am

Re: ICE

Postby Timothy_Yueh_4L » Mon Mar 11, 2019 10:27 am

When k < 10^-3, we assume the change in reactant is negligible therefore the value of the reactants is the same. Ex) A + B --> C: std defn of k = [C]/([A][B]). After equilibrium k = [C+x]/([A-x][B-x]), with x denoting the change in concentration, however the change is negligible therefore the equation is k = [C+x]/([A][B]).

Mark 1D
Posts: 63
Joined: Fri Sep 28, 2018 12:18 am

Re: ICE

Postby Mark 1D » Mon Mar 11, 2019 7:54 pm

x can be ignored, making x equal to 0

Amy Dinh 1A
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: ICE

Postby Amy Dinh 1A » Mon Mar 11, 2019 10:20 pm

We can assume x is negligible unless stated otherwise.

Jordan Lo 2A
Posts: 85
Joined: Fri Sep 28, 2018 12:25 am

Re: ICE

Postby Jordan Lo 2A » Mon Mar 11, 2019 11:03 pm

We can use the 5% rule to ignore x in the denominator of the fraction that you get from the ICE table

Charles Hood Disc 1C
Posts: 39
Joined: Fri Sep 28, 2018 12:19 am

Re: ICE

Postby Charles Hood Disc 1C » Mon Mar 11, 2019 11:16 pm

A value with less than 10^-3 means that we can approximate the x value.

isarose0
Posts: 62
Joined: Fri Sep 28, 2018 12:15 am

Re: ICE

Postby isarose0 » Mon Mar 11, 2019 11:49 pm

x would be negligible because it is so small and has little effect on the concentration

Mukil_Pari_2I
Posts: 87
Joined: Fri Sep 28, 2018 12:29 am

Re: ICE

Postby Mukil_Pari_2I » Tue Mar 12, 2019 12:19 am

The approximation can be utilized when solving ice problems if that condition is true.

jocelyntzeng
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: ICE

Postby jocelyntzeng » Sat Mar 16, 2019 12:48 pm

yes you can approximate but always check with the 5% rule


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