Identify the conjugate base in each pairs

1)RCOOH. RCOO

2)H2PO+. H2PO4

3)RNH2.RNH3+

4)H2CO3.HCO3-

1)

2)

3)

4)

Explanation:

According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.

1)

Here, is loosing a proton, thus it is considered as an acid and after losing a proton, it forms which is a conjugate base.

2)

Here, is loosing a proton, thus it is considered as an acid and after losing a proton, it forms which is a conjugate base.

3)

Here, is loosing a proton, thus it is considered as an acid and after losing a proton, it forms which is a conjugate base.

4)

Here, is loosing a proton, thus it is considered as an acid and after losing a proton, it forms which is a conjugate base.