In the purification of bauxite ore as preliminary step in the production of `Al, [Al(OH_(4))]` can be converted to `Al(OH)_(3)` by passing `CO_(2)` through it. Write an equation for the reaction that occurs.

Explanation

To convert the complex ion \([Al(OH)_4]^-\) to \([Al(OH)_3]\) by passing \(CO_2\) through it, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the reactants**: The starting material is the complex ion \([Al(OH)_4]^-\) and we are introducing \(CO_2\) into the system.

2. **Understand the role of \(CO_2\)**: When \(CO_2\) is dissolved in water, it forms carbonic acid (\(H_2CO_3\)), which can dissociate into \(H^+\) ions (or \(H_3O^+\) when considering the hydronium ion) and bicarbonate ions (\(HCO_3^-\)). This means that passing \(CO_2\) through the solution will make it acidic.

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