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.

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.

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume