Why do you use deionized water when making the aqueous solution of lithium chloride?
Water that is not deionised (for example, tap water) has ions in it that would react with the lithium chloride. Tap water has lots of ions in it thanks to the treatment process it undergoes, and I think they may also add stuff to it like flourine, to help our teeth, etc. These are just a couple of examples of where the ions come from. Think of how many ions would be in sea water thanks to all the NaCl and the metabolic activities of all the animals in there.
