<Li> particulates (typically controlled by filtration) </Li> <Li> gases (typically managed by degassing when required) </Li> <P> Distilled water is produced by a process of distillation and has an electrical conductivity of not more than 11 μ S / cm and total dissolved solids of less than 10 mg / litre . Distillation involves boiling the water and then condensing the vapor into a clean container, leaving solid contaminants behind . Distillation produces very pure water . A white or yellowish mineral scale is left in the distillation apparatus, which requires regular cleaning . Distilled water, like all purified water, must be stored in a sterilized container to guarantee the absence of bacteria . For many procedures, more economical alternatives are available, such as deionized water, and are used in place of distilled water . </P> <P> Double - distilled water (abbreviated "ddH O", "Bidest . water" or "DDW") is prepared by slow boiling the uncontaminated condensed water vapor from a prior slow boiling . Historically, it was the de facto standard for highly purified laboratory water for biochemistry and used in laboratory trace analysis until combination purification methods of water purification became widespread . </P>

Why should distilled water be used as a solvent when testing for chloride