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 TOWARDS SOLUTION B, and NO NET FLOW.

Please help!!

### 1 Answer

We had different numbers but the key is to multiply the Molarity by how many ions that are in each formula.

For the first set: (0.10 M)(4) = 0.40 M && (0.20 M)(2) = 0.40 M so there will be no net flow

For the second set: Since their both CaCl2, it looks like the lower molarity will flow into the higher.

For the third set: (0.10 M)(2) = 0.20 && (0.10 M)(2) = 0.20 .. KBr and NaCl both have 2 ions. There won’t be any net flow