No, liquid solutions do not have to be cloudy. A solution is a homogeneous mixture of two or more substances. The solute is the substance that is dissolved in the solvent. If the solute is completely dissolved in the solvent, the solution will be clear and transparent. However, if the solute is not completely dissolved, the solution may be cloudy or opaque. This is because the undissolved solute particles scatter light, making the solution appear cloudy.