Balance the following half cell reactions.
`H_(2)OtoOH^(-)+H_(2)`

Explanation

To balance the half-cell reaction \( H_2O \rightarrow OH^- + H_2 \), we will follow these steps:

### Step 1: Write the unbalanced half-reaction
The unbalanced half-reaction is:
\[ H_2O \rightarrow OH^- + H_2 \]

### Step 2: Count the number of atoms on each side
- On the left side (reactants), we have:
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