[samiam]

1. Consider HSO4^-(aq) + H20(l)-->. SO4^2- + H3O^+
which statement is true A) HSO4^- IS base and H3O+ is conjugate acid or b) HSO4^- is not an acid and thus equation is incorrect
I believe the answer Is A, the only thing that does not make me think this is 100% correct is HSO4^- is not a strong acid only H2SO4 is so because HSO4^- is a weak acid should the reaction be double arrowed?  because when weak acid or bases react with water or other strong acids and bases I noticed the reaction is always double arrowed?

2. which of the following ion pairs cannot exist in large concentrations
a) K+ and CH3COO^-     b) Pb^2+ and CLO4^-  or c) Ag^+ and Cl^- my answer was C because it is insoluble.

[Borek]

You are twice right.

Don't worry too much about arrow/double arrow, this is a convention that is not well defined and not rigorously used.

[cliverlong]

1. Consider HSO4^-(aq) + H20(l)-->. SO4^2- + H3O^+

Can you please use the "sup" and "sub" buttons on the forum editor. They take seconds to apply to a post.

They make posts much easier to read than trying to decipher "^" - which is unnecessary with these simple formatting tools

e.g. HSO₄^-(aq) + H₂0(l)    SO₄^2- + H₃O⁺