A solution containing only K2CrO4 will have a yellow color. Potassium chromate (K2CrO4) is a yellow-colored chemical compound that is highly soluble in water. When dissolved in water, the K2CrO4 compound dissociates into K+ and CrO42- ions, which give the solution its characteristic yellow color. Therefore, a solution containing only K2CrO4 will have a yellow color, which can range from pale yellow to bright yellow depending on the concentration of the solution.