Net Ionic

[Baylor2011]

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Can somebody explain this one to me?

Net ionic equation for:

HCl (aq) + NaOH (aq) -> H2O (l) + NaCl (aq)

Answer is: H3O+ (aq) + OH (aq) -> 2H2O (l)

What I'm confused with is where did the H3O come from, and how did H2O get from one equivalent to two?

Thanks

 

[Charmm]

H+ never exists as it is shown, in (aq) phase H3O+ exists. Just a format problem dont worry

 

[Baylor2011]

So when they give the net ionic equation of: BaCO3 (s) + HCl (aq) as:

BaCO3 (s) + 2H+ (aq) -> H2O (l) + CO2 (g) + Ba2+ (aq)

Confused now!! 😕

 

[rpatel8]

Hmm, this is interesting but my take is that HCl and NaOH are strong acid/base respectively so they dissociate completely to H3O+ and OH-. Then you balance H3O+ and OH- and you get 2H2O because you have 4 Hs and 2 Os as reactants. The NaCl, I wouldn't think has any ionic role in this. Anyone else have any ideas?

 

[levesque2177]

HCl and NaOH are strong acids and bases. so that means that their pH when mixed in equal moles will be at about 7 (complete dissociation). so their net ionic is the same as that of water, which is H3O+ + OH- --> 2H2O. NaCl is actually a spectator since its a salt and can be ignored for the net ionic equation.