The surface of Titan (the largest moon of Saturn) is much colder than the freezing temperature of water. However, there have likely been pools of liquid water at or near its surface, lasting perhaps thousands of years, caused by melting from impacts or liquid water coming up from a subsurface ocean. Titan's thick atmosphere includes a haze made of suspended and falling complex organic molecules. These particles can be simulated in the laboratory, and other scientists have shown that when mixed with water, prebiotic molecules can be produced. In this study, we take laboratory-simulated haze particles (called 'tholins') and soak them in water for enough time for this prebiotic chemistry to occur. We then separate the dissolved portion of the tholins from the undissolved portion, and use multiple instruments to characterize how the two substances are different from each other and from the original, dry particles. The differences may have implications for how real particles that are exposed to water on the surface of Titan behave and change over time.