Here's why:

* Ionic compound: Sodium carbonate is an ionic compound, meaning it's formed by the attraction between positively charged sodium ions (Na⁺) and negatively charged carbonate ions (CO₃²⁻).

* Polarity: Water is a polar solvent, meaning it has a positive and negative end due to the uneven sharing of electrons. This polarity allows it to attract and surround the ions of sodium carbonate, breaking apart the crystal lattice and dissolving it.

The solubility of sodium carbonate in water is about 21.5 grams per 100 milliliters of water at room temperature.