Question

One mole of H2SO4 should completely react with 2 mopes of NaOH. How does avagadro's number help the explain it?​

Answer 1

Answer:

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Explanation:

A mole is just a unit of quantity; that is, it's a number of things you have. Just like a dozen is 12 of something, a mole is 6.022e23 (Avogadro's number) of something. This is such a large number as to be beyond human comprehension. It's such a large number that the only thing it makes sense to count with this number is something as small as molecules.

But it's still just a number like any other.

Saying that two moles of NaOH should react completely with one mole of H2SO4 (which I don't even think is true, since only the first proton is a strong acid, with a pKa of -3; the second has a pKa of 1.9) is just a "scaled-up" version of saying that two dozen molecules of NaOH should react completely with one dozen molecules of H2SO4. It's just an expression of the ratio that these two reactants will react in. You can scale the ratio up by any number you want - by a factor of 12 or a factor of 6.022e23 or anything in between - and it doesn't change things.

Avogadro's number isn't special. It doesn't explain why NaOH and H2SO4 supposedly react in a 1:2 ratio, any more than "3" explains what happens when you put zinc metal in HCl. A single number - one not even tied to a physical property or anything - doesn't explain why a reaction happens the way it does. That doesn't make sense.

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