Approximation of x

Acidity
Basicity
The Conjugate Seesaw

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Jessica Tsui 1H
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

Approximation of x

Postby Jessica Tsui 1H » Wed Jan 16, 2019 6:00 pm

Can we only assume x is negligible (after ICE table) if the reaction is with a weak acid?

Nada AbouHaiba 1I
Posts: 77
Joined: Fri Sep 28, 2018 12:28 am
Been upvoted: 1 time

Re: Approximation of x

Postby Nada AbouHaiba 1I » Wed Jan 16, 2019 6:17 pm

Yes! Professor Lavelle mentioned that anytime the K value is less than 10^-3, the approximation of x in the reactant-x is negligible.

LilyL1C
Posts: 24
Joined: Fri Sep 28, 2018 12:20 am

Re: Approximation of x

Postby LilyL1C » Wed Jan 16, 2019 7:01 pm

Yes, we can assume that x is negligible if the K value is less than 10^(-3), and today in class, Lavelle said that all weak acids will have a K value less than 10^(-3). So you can do it for all weak acids.

KatrinaPho_2I
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

Re: Approximation of x

Postby KatrinaPho_2I » Thu Jan 17, 2019 11:26 am

Just keep in mind that only the x in the (reactant-x) is negligible. The other changes in concentration for the products still have to be considered.


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