The solubility of k2cr2o7 in water is 125 g/l at 20 °c. a solution is prepared at 20 °c that contains 6.0 grams of k2cr2o7 in 50. ml of water. this solution is

The solubility is the guide to the maximum amount of solute that can be dissolved in a certain amount of solvent at a certain temperature to make a saturated solution. Any amount less than this would result to unsaturated, while any amount more would result to saturated.

6 g / (50 mL * 1 L/1000 mL) = 120 g/L

Since it is less than the solubility of 125 g/L, then this solution is unsaturated.