What is the Common Ion Effect?

[JessicaHelena]

Homework Statement

What is the common ion effect? I've been searching online for quite a while but none of the answers already out there seems to clear things up for me...

Homework Equations

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The Attempt at a Solution

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[Borek]

I don't think we will be able to provide better explanations than the ones you can find.

So, for example - have you seen the Khan academy video? Where do you get lost?