Assuming X

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Leslie Almaraz 4G
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Assuming X

Postby Leslie Almaraz 4G » Thu Jan 23, 2020 11:55 pm

Do you only assume x has a small change if Ka or Kb is less than 10^-3?

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Re: Assuming X

Postby 805312064 » Fri Jan 24, 2020 12:14 am

Yes, I believe so

Ariel Davydov 1C
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Re: Assuming X

Postby Ariel Davydov 1C » Fri Jan 24, 2020 10:06 am

Yes, and if the percent protonation of the base or percent deprotonation of the acid is less than 5%.

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Re: Assuming X

Postby Michellekim1H » Sat Jan 25, 2020 12:13 pm

I think for all questions concerning ICE tables, it’s okay to assume that x is an extremely small number if K(Ka, KB, etc) if is less than 10^-3. For this specific type of problem, if x is less than 5% of the initial acid then the approximation should be fine.

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