ICE Table

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Raquel Rodriguez
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Joined: Fri Sep 28, 2018 12:26 am

ICE Table

Postby Raquel Rodriguez » Thu Jan 17, 2019 12:19 pm

When doing ICE Table are we able to ignore the x that is in the denominator? and when is it only possible?

Chem_Mod
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Re: ICE Table

Postby Chem_Mod » Thu Jan 17, 2019 1:47 pm

We assume that x is much smaller compared to the number that x is being subtracted from (with in 5%). It simplifies the calculation from solving a quadratic equation.

Alexa_Henrie_1I
Posts: 61
Joined: Fri Sep 29, 2017 7:03 am

Re: ICE Table

Postby Alexa_Henrie_1I » Thu Jan 17, 2019 3:15 pm

We can take this short cut when the value of K is < 1x10^-3

Maayan Epstein 14B
Posts: 39
Joined: Fri Sep 28, 2018 12:20 am

Re: ICE Table

Postby Maayan Epstein 14B » Thu Jan 17, 2019 3:20 pm

The reason that you can do an approximation where you "ignore" the x in the denominator, is because if the K value is smaller than 10^-3, then the x when multiplied out by this k value will be very negligible. So, instead of going through the whole process and doing the quadratic formula in this specific case, it is much easier and still pretty accurate to approximate the value of x in the denominator to be equal to zero.

Ray Huang 1G
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

Re: ICE Table

Postby Ray Huang 1G » Thu Jan 17, 2019 3:26 pm

You can ignore it when the value of x you calculated is less than 5% of the initial concentration. If the x value is anywhere near or greater than 5% you have to do the quadratic by hand.

JeremyPark14B
Posts: 29
Joined: Fri Sep 28, 2018 12:19 am

Re: ICE Table

Postby JeremyPark14B » Thu Jan 17, 2019 3:39 pm

if X is smaller than 10^-3, adding it into a number will have nearly no effect. However, X^2 is significantly larger than just X. Therefore if X is smaller than 10^-3, it is negligible.


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