Question

4% naoh and 6% urea are equimolar but are not isotonic why ?

Answer 1

Hey mate here's your answer

Solutions having same osmotic pressure are called isotonic solutions. They have same number of particles in solution and have same molar concentration.

Even though , two solute have equilmolar concentration.

NaOH and NH2CONH2, they both have different number of ions in solutions.

NaOH = 2 ( Na+ and OH-)

NH2CONH2 = 1 , so they have different van't hoff factor and Hence can not have same osmotic pressure.

Thus are not isotonic solution.