CaCl2 is widely used to melt frozen precipitation on sidewalks after a winter storm. Could CaCl2 melt ice at -20°C? Assume that the solubility of CaCl2 at this temperature is 70.0 g/100.0 g of H2O and that the Van’t Hoff factor (i) for a saturated solution of CaCl2 is 2.5 (Kf for water is 1.86 °C/m