Which classification of solution indicates no net movement of water in or out of cells?

The classification of solution that indicates no net movement of water in or out of cells is isotonic. In an isotonic solution, the concentration of solutes outside the cell is equal to the concentration of solutes inside the cell. This balance means that the osmotic pressure is the same on both sides of the cell membrane, allowing water to move in and out at equal rates. As a result, there is no net movement of water, and the cell remains in a state of equilibrium.

In contrast, hypertonic solutions have a higher concentration of solutes outside the cell compared to the inside, leading to water moving out of the cell and potentially causing it to shrivel. Hypotonic solutions have a lower concentration of solutes outside the cell than inside, resulting in water moving into the cell, which can cause it to swell and possibly burst. Acidic, while related to pH, does not pertain directly to osmotic balance and therefore is not relevant to this question about water movement across cell membranes.