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Hi Lindsey Chheng 1H! To answer your question, when an acid is negatively charged, it will be in the "ionized" form (it will dissociate). The example Dr. Lavelle gave in class is when an acid is poured in a solution and the solution's pH is either greater than pKa or less than pKa. The solution will be negatively charged when it is in the deprotonated form (meaning that the acid dissociates into H+ and A-). When the surrounding solution has a pH of greater than pKa, then the acid will be deprotonated and the solution would be negatively charged. When the surrounding solution has a pH of less than pKa, then the acid will remain in the protonated form (meaning it will stay as HA). I like to think of it as, which is a stronger acid, the surrounding solution or the acid? The one that is stronger will be the one that will dissociate and takes control. The stronger solution kind of kicks out the other species and takes precedence. I hope this helps!
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