Nifedipine Chemical Properties Melting point 171-175 °C Boiling point 481.08°C (rough estimate) density 1.2109 (rough estimate) refractive index 1.5486 (estimate) storage temp. 2-8°C solubility DMSO: soluble form powder pka pKa -0.9/>13(DMF,t undefined) (Uncertain) color yellow Water Solubility <0.1 g/100 mL at 19.5 ºC