What is the [SO42-] in 0.45 M of H2SO4?
How far are you along in chemistry? The simple answer, at least for beginners, is 0.45M.
The more complicated answer is
..........H2SO4 ==> H^+ + HSO4^-
equil......0.45....0.45...0.45
........HSO4^- ==> H^+ + SO4^2-
I.......0.45......0.45....0
C.......-x..........x......x
E.....0.45-x....0.45+x.....x
k2 H2SO4 = about 0.012 = (0.45+x)(x)/(0.45-x) an solve for x = (SO4^2-).I obtained about 0.011 which is nowhere close to 0.45M. You need to confirm these numbers.
an