Answer
(a) Image below:
(b)
-$H_2C_2O_4$ and $H_3O^+$: Only like acids.
- $C_2{O_4}^{2-}$: Only like a base.
- $HC_2{O_4}^-$: Both acid and base.
Work Step by Step
(a)
- All you need to do is: Take the structure that is on the question, and remove the hydrogens, until you got the formula you want.
(b)
- Acids are capable of donating a ($H^+$), and bases can receive one ($H^+$).
- $H_2C_2O_4$ and $H_3O^+$, can't receive one proton, but are capable of giving.
- $C_2{O_4}^{2-}$, doesn't have one proton, but can receive it.
- $HC_2{O_4}^-$: Can both receive and donate.
