Give the formula for the conjugate base of each acid.

A.HSO4-

B.H3PO4

C.HPO42-

I have my answers as

h2so4
h2po4
h2po4-

my answrers are wrong, please help

I think you've missed the boat with regard to conjugate acids/bases. I think students make this much harder than it is. Here is the simple scoop.

From whatever you have, if you want the BASE you take away a H. If you want the
ACID you add a H.
HSO4. The conjugate base is SO4^2-, the conjugate acid is H2SO4
For B the C.base is H2PO4^-.
For C it will be ......

To obtain the conjugate base of an acid, you need to remove a proton (H+) from the acid. Here are the correct formulas for the conjugate bases of the given acids:

A. HSO4- (acid) -> SO42- (conjugate base)

To convert HSO4- into SO42-, you need to remove the proton (H+) from HSO4-. So, the formula for the conjugate base of HSO4- is SO42-.

B. H3PO4 (acid) -> H2PO4- (conjugate base)

To convert H3PO4 into H2PO4-, you need to remove one proton (H+) from H3PO4. So, the formula for the conjugate base of H3PO4 is H2PO4-.

C. HPO42- (acid) -> PO43- (conjugate base)

To convert HPO42- into PO43-, you need to remove one proton (H+) from HPO42-. So, the formula for the conjugate base of HPO42- is PO43-.

Therefore, the correct formulas for the conjugate bases are:

A. Conjugate base of HSO4-: SO42-
B. Conjugate base of H3PO4: H2PO4-
C. Conjugate base of HPO42-: PO43-