Select all of the correct statements about the relative acid strengths of pairs

Question

Select all of the correct statements about the relative acid strengths of pairs of acids from the choices below.

1) HCl is a stronger acid than H2S because Cl is more electronegative than S.

2) HPO42- is a stronger acid than H2PO4- because it has more charge (is more unstable).

3) H2O is a stronger acid than NH3 because O is more electronegative than N.

4) HClO is a stronger acid than HClO2 because it has fewer oxygens surrounding the central Cl atom.

5) H3AsO4 is a stronger acid than HAsO42- because it has more acidic H atoms.

6) HIO is a stronger acid than HIO4 because it has fewer oxygens surrounding the central I atom.

Explanation / Answer

1) Ture, H-Cl bond is electronegative, so when in a solution, they will dissociate completely and H+ ions will be all around the solution increasing ph... H2S is a weak acid since this is a COVALENT bond

2) False, actually pKa2 > pKa3 ... The more you dissociate a triprotic acid the less stronger is the acid. Having more charge has NOTHING to do with that!

3) H2O is stronger due to the possibility of form H+ ions when donating OH- ions (to the NH3 of course). electronegativities here has nothing to do.

4) FALSE. Actually HClO2 is a stronger acid than HClO. The higher the oxidation state of the pair, the probability of this being a stornger acid is very high

5) Ture. It is easier to H3AsO4 to lose 1 or 2 hydrogens than for HAsO4 -2 to lose one!

6) Same as in 4) it is the reverse!. Answer is FALSE

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