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Answer 1 · 2015-03-25T07:43:46

Basic. The sulfate ion is the conjugate base of the bisulfate ion, which is a conjugate base of sulfuric acid.

$H_2SO_4 -> H^+ + HSO_4^-$ (Dissociation 1)

$HSO_4^-$ $-> H^+ + SO_4^-2$

$Na_2SO_4 ------> 2 Na + SO_4^-2$

Reversing the flow of equation above

$SO_4^-2 + H_2 O -> HSO_4^- + OH^-$

The $OH^-$ ion make the solution basic.