## Approximation of x

Acidity $K_{a}$
Basicity $K_{b}$
The Conjugate Seesaw $K_{a}\times K_{b}=K_{w}$

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

### Approximation of x

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

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### Re: Approximation of x

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

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

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.