Are there any volatile, no residue dyes that can be mixed in acetone, denatured alcohol, or isopropyl alcohol to serve as a quick glace indicator of what the chemical is? For example, blue could be associated with acetone, red-denatured, and green isopropyl.

Can i know how to conduct vapor-liquid equilibrium (VLE) experiment for propane-heptane? How many mL of propane and heptane that i should use to perform VLE graph? And it is possible to use normal stirring extraction method to obtain the VLE graph?
Anyone can help me to describe the whole experiment for me?

1) 2-methyl-3-pentanol
2) 3-phenyl-2-butanol
3) cis-1,4-cyclohexadiol

I need to work out all on my own what the length of the capillary tube should be and what the id of it must be for different types of domestic refrigerant and compressor sises

We use R22 ;R134A ;and R600 refrigerant gasses and 1/6 ;1/5 and 1/4 hp comresors . The fridges all differ in size

We all know Solar cells lifetime is about 20+yrs. How can we be able to decompose the dead solar cells? Is it fully bio-degradable?