An Equation with both Weak Acids and Salt

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VivianaHF2L
Posts: 29
Joined: Fri Sep 28, 2018 12:20 am

An Equation with both Weak Acids and Salt

Postby VivianaHF2L » Fri Jan 18, 2019 2:11 pm

When do we know to change the X to zero so that we do not have to do the quadratic formula?
Does this change when there is now multiple reactions happening as in a solution that has a weak acid and salt that disassociates.

whitney_2C
Posts: 74
Joined: Fri Sep 28, 2018 12:28 am

Re: An Equation with both Weak Acids and Salt

Postby whitney_2C » Fri Jan 18, 2019 2:43 pm

We never really change X to zero because if X is 0 then that means that some of the concentrations for reactant/products at equilibrium are zero which doesn't make sense, but we do neglect the X if it is added or subtracted from a concentration in our K expression if the K value is less than 10^-3.


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