Hi, I have a concept I need you to explain for me... There\'s a rule that says [

Question

Hi, I have a concept I need you to explain for me...

There's a rule that says [HA] "initital" ~ [H3O], Can we ever asume it's exactly equal and put the same initial concentration for both the acid and the hydronium ion in an ice table? Here's an exampl of what I'm trying to say:

PS: I wrote a few more questions in this photo so please be sure to read the whole thing.

ionizes Gag) I urns Can I do that -s why didnt we use the ner i nic equchin here T l now nothin remains left in the equatien but why did ue en use onginal equch tun as opposed to the ner ionic equehin the

Explanation / Answer

You can assume it's exactly equal and put the same initial concentration for both the acid and the hydronium ion in an ice table if and only if HA is a strong acid i.e if HA ionizes 100% in water.

Even if we use the net ionic equation, while doing ICE calclautions or while calculating equilibrium constants, they are going to get cancelled away anyway. The use of these net ionic equations is to understand clearly what reactions are going on individually at ionic level. But it is no where significant when it comes to thermodynamics and kinetics of the reaction.

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