A 1.2%(w/v) of solution of NaCl is isotonic with 7.2%(w/v) of solution of glucose. Calculate the van't Hoff factor of NaCl solution

van't Hoff factor of NaCl about 1.95 because it will be ionise into two ions. NaCl⇌Na++Cl−πNacl =πglucose iCNacl=iCglucose iNaCl ×1.2 58.5=1×7.2180 iNaCl =1.95