Question

An elastic (stretchable) balloon made of a material that is permeable to water but not to any solutes is filled with an aqueous solution containing 0.1 M glucose and 0.3 M NaCl. The balloon is then sealed and completely immersed in an second aqueous solution with NaCl as the only solute. The balloon does not expand or contract. What is the concentration of NaCl in the solution that the balloon was immersed in (the second solution)? Assume all salts undergo complete dissociation.

Answer 1

Let C1=0.1M glucose, C2 =0.3 M NaCl solution , C3 = to be calculated

The concentration Inside balloon = C1+ C2 which is dipped in the second aqueous solution with a concentration C3

As we know that the balloon does not expand or contract so the osmotic pressure inside the balloon and osmotic pressure outside the balloon is the same. So keeping them equal and solving it will give us the concentration of the second solution.