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In a problem where we have to calculate the pH of a solution of a weak acid + its salt, do we have to take the cations into account? for example the problem in class professor Lavelle told us - the thing with nitrous acid + potassium nitrite. Do we have to take the potassium ions into account? Or do those not matter?
In general, when creating ICE tables, you are only looking at the molecules that affect pH. Therefore, if a cation/anion does not appear in the acid/base reaction, then one does not have to take the cation/anion into account.
As mentioned in 14A, Group 1 mentally and group 17 halogens do not affect the pH of a solution at all. On the other hand group two metals slightly change the pH but not by a drastic amount.
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