Inorganic Crystals: Copper Sulfate Pentahydrate

Structure Crystal structure Triclinic (pentahydrate), space group P-1, a = 0.5986 nm, b = 0.6141 nm, c = 1.0736 nm, α = 77.333°, β = 82.267°, γ = 72.567°   Properties Chemical formula CuSO4·5H2O (pentahydrate) Molar mass 249.685 g/mol (pentahydrate) Appearance blue (pentahydrate) Density 2.286 g/cm3 (pentahydrate) Melting point 110 °C (230 °F; 383 K) decomposes (·5H2O) <560 °C decomposes Solubility in water 1.055 molal (10 °C) 1.26 molal…

Salt crystals growing and dissolving!

I saw Manu’s recent video showing snowflakes (ice crystals) melting to form water. I thought I’d try something similar with salt crystals, which slowly dissolve and re-form when placed in water containing a high concentration of dissolved salt: https://www.youtube.com/watch?v=-bjJVQ5kVRY&feature=youtu.be https://www.youtube.com/watch?v=wwSoW3LIg6E All videos shown at 120x actual speed. I made a super-saturated salt solution by pouring two…