p-Toluenethiol Chemical Properties Melting point 84-86(lit.) Boiling point 195 °C(lit.) density 1.0220 vapor density 6.2 (vs air) vapor pressure 10 mm Hg ( 71 °C) refractive index 1.5420 (estimate) Fp 155 °F storage temp. Store at RT. pka pK1:6.52 (25°C) form Fused Solid color White to yellow