Sаline sоlutiоn is criticаl in mаny medical applicatiоns. It is simply a solution of sodium chloride (Na+ -Cl) in water, and is often supplied in concentrated form that would need to be diluted before use. The concentrated form is called 23.4% sodium chloride and it consists of 23.4 g in 100 mL of water. Note that sodium chloride is written here as Na+ -Cl to emphasize that it is an ionic compound, normally is would be written more simply as NaCl What is the concentration of 23.4% sodium chloride in M units? The average atomic weight of sodium is 22.990 g/mol The average atomic weight of chlorine is 35.453 g/mol