Question

one person said that isotonic solutions have concentration of .28 M while another says that the concentration of NaCl in an isotonic solution is .14M. How can this be true?

Answer 1

Isotonic solution meanes that that two solution have same osmotic pressure. Hence NaCl is strong electrolyte and give two ions in solution and osmotic pressre is a colligative proprety ie it depends on the no of ions present of solution. So first person cosider that ionisation (Na+ Cl -) second person did cont cosider that ionisation. Another thing can aslo happen that that two solution having different temparture have give sam osmotic pressure having double concentration .