ICE table approximation


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Jasmine W 1K
Posts: 49
Joined: Sat Sep 07, 2019 12:18 am

ICE table approximation

Postby Jasmine W 1K » Thu Jan 23, 2020 12:31 pm

How do you know whether you can use the approximation shortcut rather than the quadratic equation for problems involving ICE tables?

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

Re: ICE table approximation

Postby Sidharth D 1E » Thu Jan 23, 2020 12:37 pm

You can approximate if the K value for the table is less than 10-3.

Cooper Baddley 1F
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

Re: ICE table approximation

Postby Cooper Baddley 1F » Thu Jan 23, 2020 12:42 pm

If the K value is less than 10^-3 and then if the percent protonation is less than 5% it is ok to take the shortcut.

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

Re: ICE table approximation

Postby Ying Yan 1F » Thu Jan 23, 2020 12:45 pm

If you have a K value that is smaller than 10^-3, then you can use the approximation shortcut. If you still need more clarification, Dr. Llavell talks about this in Video Module 3. Hope that helped!

Vincent Leong 2B
Posts: 207
Joined: Fri Aug 09, 2019 12:15 am

Re: ICE table approximation

Postby Vincent Leong 2B » Thu Jan 23, 2020 2:25 pm

The approximation is only used when K is small enough and you know this approximation works if the x you solve for is < 5% of the initial concentration.

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

Re: ICE table approximation

Postby ValerieChavarin 4F » Thu Jan 23, 2020 2:27 pm

You take a look at the K value. If it is less than 10^-3, then you can approximate. If the K value is 10^-3, it can get a bit tricky, so I would still do the full calculation.

Ayushi2011
Posts: 101
Joined: Wed Feb 27, 2019 12:17 am

Re: ICE table approximation

Postby Ayushi2011 » Fri Jan 24, 2020 12:24 pm

If K value is very small, we can approximate.

William Francis 2E
Posts: 101
Joined: Wed Sep 18, 2019 12:20 am

Re: ICE table approximation

Postby William Francis 2E » Fri Jan 24, 2020 10:11 pm

You can check that your approximation is valid after solving by showing that your calculated x value is less than 5 percent of the initial concentration of the weak acid or base being used.

Tahlia Mullins
Posts: 105
Joined: Thu Jul 25, 2019 12:15 am

Re: ICE table approximation

Postby Tahlia Mullins » Fri Jan 24, 2020 10:17 pm

To verify that the approximation is valid, divide x by the initial value and multiply by 100, and if the value is less than 5%, then it is valid.

Kylie Lim 4G
Posts: 110
Joined: Sat Aug 17, 2019 12:15 am

Re: ICE table approximation

Postby Kylie Lim 4G » Fri Jan 24, 2020 11:57 pm

You can approximate that x is 0 when K<10^-3. You can always check to see if an approximation is valid if x is less than 5% of the initial concentration.

Megan Cao 1I
Posts: 103
Joined: Sat Sep 07, 2019 12:18 am

Re: ICE table approximation

Postby Megan Cao 1I » Sat Jan 25, 2020 12:25 am

you can approximate shortcut when K is less than 10-3.


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