Ka/Kb of 10^-4

[Parker Smith]

I know Dr. Lavelle said to be careful with K values of 10^-4 and using the assumption rule. When is it "safer" to use the assumption rule for values of K equal to 10^-4?

[KBELTRAMI_1E]

It's not "safe" when the value is like 8.5555x10^-4 because that's too close to 10^-3. if its 2.57584 x10^-4 you should be good. he said they would make it obvious on the test though.

[805307623]

I would say not to use the assumption for 10^-4, just to be safe.

[DanielTalebzadehShoushtari2A]

You can use the assumption to calculate x, and then check to see if x is less than 5% of the original concentration. If it is, then the assumption is valid.