Chemistry help (acids & bases)?

Question

1. Identify the hydrogen ion donor(s) and hydrogen ion acceptor(s) for ionization of H2SO4 in waer. Label the conjugate acid-base pairs.

2. Identify all of the ions that may be formed when H3PO4 ionizes in water.

Explain please.

Answer 1

H2SO4 + H2O --> H3O+ + HSO4-  (strong acid, completely dissociates)

HSO4- + H2O <==> H3O+ + SO3=  (weak acid, partially dissociates)

The acid is pretty obvious.  Which means the base is too.  The conjugate acid donates a proton to the conjugate base in the reverse reaction.  Hint:  Hydronium ion is a proton donor.

When H3PO4 dissociates the primary products are H+ and H2PO4-.  But H2PO4- is a weak acid and can dissociate, even into weaker acids.  Therefore you will get some of all of the following:

H+, H2PO4-, HPO4=, PO4^3-