In the context of solutions, a hypotonic solution is defined as having a lower concentration of solutes compared to another solution, while a hypertonic solution has a higher concentration of solutes.
Therefore, when we consider which solution has the greatest concentration of water, it is the hypotonic solution that holds this distinction. Since a hypotonic solution contains fewer solutes, it inherently has a higher proportion of water relative to those solutes.
On the other hand, when we refer to the solution with a greater concentration of solutes, this would be the hypertonic solution. Hypertonic solutions contain more solutes, which means there is less water available in comparison.
To summarize, the hypotonic solution has the greatest concentration of water, whereas the hypertonic solution has the greatest concentration of solutes.