Isotonic solutions have same

Isotonic solutions have same molar concentrations with same no. of moles.

${\mathrm{\pi }}_1={\mathrm{C}}_1\mathrm{ST}; \mathrm{for} \mathrm{first} \mathrm{solution}$

${\mathrm{\pi }}_2={\mathrm{C}}_2\mathrm{ST}; \mathrm{For} \mathrm{second} \mathrm{solution}$

If  ${\mathrm{C}}_1={\mathrm{C}}_2 \mathrm{then} {\mathrm{\pi }}_1={\mathrm{\pi }}_2$

Here, ${\mathrm{C}}_1,{\mathrm{C}}_2\mathrm{are} \mathrm{molar} \mathrm{concentrations} \mathrm{of} \mathrm{two} \mathrm{different} \mathrm{solutions} \mathrm{and} {\mathrm{\pi }}_1,{\mathrm{\pi }}_2$ are osmotic pressures of two solutions.