The concentration of sodium ions in the standard WHO oral rehydration Solution is:

Concentration of Na+ is 90 mmol/L in standard WHO-ORS whereas it is 75 mmol/L in New formula ORS. NEW FORMULA ORS contains :- Na+ - 75 mM k+ - 20mM Cl- - 65mM Glucose - 75mM Citrate - 10mM Total - 245mOsm/L