Question

A semipermeable membrane separates two aqueous solutions at 20 °C. For each of the following cases, name the solution into which a net flow of water (if any) will occur. Assume 100% dissociation for electrolytes.

Solution A: 0.10M Al(NO3)3 Solution B: 0.20M NaNO3 Solution A: 0.10M CaCl2 Solution B: 0.50M CaCl2 Solution A: 0.1M NaCl Solution B: 0.1M KBr Which group has a net flow towards solution A, net flow solution towards solution B, and no net flow?

Answer 1

The first step is to multiply the molarity with the amount of ions in each formula.

For the first pair= (0.1 M)(4)= 0.4 M and (0.2 M)(2)= O.4 M -> There is no net flow.
For the second pair= Since both are the same type of solution, solution A which has a lower concentration will flow to solution B which has a higher concentration.
For the third pair, (0.1 M)(2)= 0.2 M and (0.1 M)(2)= O.2 M. There is no net flow since KBr and NaCL both have 2 ions.