Give the conjugate base of (i)`H_2O` , (ii)`HNO_3` , (iii)HI , (iv)`NH_4^+` , (v) `HCO_3^-` , (vi) `OH^-`

Explanation

To find the conjugate bases of the given substances, we need to understand that a conjugate base is formed when an acid donates a proton (H⁺). Here’s how we can determine the conjugate bases for each of the given substances:

### Step-by-Step Solution:

1. **Identify the Acid**: Determine the substance that will act as an acid by donating a proton (H⁺).

- **(i) H₂O**: Water can act as an acid by donating a proton.
- **Conjugate Base**: H₂O → H⁺ + OH⁻
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