The molecule that would move fastest across the membrane is hydrochloric acid (mw = 36).
The water-based, or aqueous, solution of hydrogen chloride gas is known as hydrochloric acid. It is also the primary ingredient in gastric acid, which is naturally produced in the human stomach to aid with food digestion. For a variety of industrial and commercial uses, hydrogen chloride gas can be dissolved in water to create hydrochloric acid. This procedure is just one of many manufacturing methods.
Steel used in the building and construction business can be processed using the powerful, corrosive hydrochloric acid. It is one of the compounds used in the chemical industry to generate calcium chloride, polyurethane foam, and vinyl chloride, which is used to make polyvinyl chloride (PVC) plastic on a massive scale.
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