Arrange alkali metal carbonate in increasing order of solubility.

Explanation

To arrange alkali metal carbonates in increasing order of solubility, we need to consider the general trend of solubility of these carbonates as we move down the group in the periodic table.

### Step-by-Step Solution:

1. **Identify the Alkali Metal Carbonates**: The alkali metal carbonates we are considering are:
- Lithium Carbonate (Li2CO3)
- Sodium Carbonate (Na2CO3)
- Potassium Carbonate (K2CO3)
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