The solubility of an ionic salt in seawater is determined by the equilibrium between the dissolved salt and the undissolved salt. When the concentration of the dissolved salt is equal to the concentration of the undissolved salt, the solution is said to be saturated. If the concentration of the dissolved salt is greater than the concentration of the undissolved salt, the solution is said to be supersaturated and the salt will begin to precipitate out of the solution.
The volume of the solution in a conical flask is important because it affects the concentration of the dissolved salt. If the volume of the solution is increased, the concentration of the dissolved salt will decrease. This is because the same amount of salt is now dissolved in a larger volume of water. Conversely, if the volume of the solution is decreased, the concentration of the dissolved salt will increase. This is because the same amount of salt is now dissolved in a smaller volume of water.
The volume of the solution in a conical flask is important for determining the solubility of an ionic salt in seawater because it affects the concentration of the solution, which in turn affects the equilibrium between the dissolved salt and the undissolved salt.