Here's why:

* General Solubility Rules: Nitrate salts (like chromium (III) nitrate) are generally soluble in water.

* Polarity: Water is a polar solvent. Chromium (III) nitrate is an ionic compound, meaning it has a positive and a negative charge. The polar nature of water allows it to interact with and dissolve ionic compounds.

Let me know if you have any other solubility questions!