Question

Water is moving across a membrane from solution a into solution

b. What can be inferred? Solution a must be pure water. Solution a must have a lower solute concentration than solution
b. Solution a must have a higher solute concentration than solution
b. Solution a and solution b must have the same concentration of solutes. Solution b must be pure water.

Answer 1

The answer is solution a must have a lower solute concentration than solution b.

That is when water is moving across a membrane from solution a into solution b, then solution a must have a lower solute concentration than solution b.

When solution a have a lower solute concentration than solution b, then water moves across a membrane from solution a into solution b.