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Solution

Determine the conjugate acid for each:
 

H3O+   HF  
H2CO3   HSO4-  
H2O   HPO42-  
H3PO4   HCl  
HClO4   CH3COOH  
H2S   HCN  
H2SO4   NH4+  

 

Determine the conjugate base for each:
 

OH-   F-  
CO3-2   SO4-2  
O-2   PO43-  
H2PO4-   Cl-  
BrO2-   CH3COO-  
SH-   OCN-  
SO4-2   NH2-