When can "-X" be disregarded?

Moderators: Chem_Mod, Chem_Admin

Max Hayama 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

When can "-X" be disregarded?

Postby Max Hayama 4K » Wed Jan 09, 2019 11:47 am

When calculating for equilibrium concentrations using initial concentrations, the variable "x" is used as a placeholder for the change in concentration from initial to final. When is this change negligible enough to disregard it, so that solving quadratic or cubic equations can be made simpler?

AdityaGuru1H
Posts: 65
Joined: Fri Sep 28, 2018 12:17 am

Re: When can "-X" be disregarded?

Postby AdityaGuru1H » Wed Jan 09, 2019 1:13 pm

If i remember correctly from his videos we would disregard it if we were working with a cubic equation and if the k is less than 10^-4

Shally Li 2C
Posts: 30
Joined: Fri Sep 28, 2018 12:22 am

Re: When can "-X" be disregarded?

Postby Shally Li 2C » Wed Jan 09, 2019 3:05 pm

According to the textbook, x can be disregarded when it is less than 5% of the initial value. You can do this when you have a small K value.


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 2 guests