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