Sodium nitrate solution is typically colorless. This is due to the fact that sodium nitrate (NaNO3) is a white crystalline solid that, when dissolved in water, does not impart any color to the solution. The colorless nature of the solution is consistent with the physical properties of sodium nitrate, which is an inorganic compound composed of sodium and nitrate ions. The absence of color is a result of the lack of chromophores, which are molecules or parts of molecules that absorb light at specific wavelengths and give rise to color. In the case of sodium nitrate, the electronic structure of the ions does not allow for the absorption of visible light, leading to a transparent, colorless solution. This characteristic is supported by various scientific literature and databases, which consistently report the color of sodium nitrate solutions as colorless.