What is the name of the solution in which the water concentration is the same as that in the cell?

The solution in which the water concentration is the same as that in the cell is called an isotonic solution. An isotonic solution is one in which the concentration of solutes (e.g., salts, sugars) is the same inside and outside the cell. This means that the movement of water molecules into and out of the cell is balanced, and there is no net movement of water.

In contrast, a hypotonic solution has a lower concentration of solutes than the inside of the cell, causing water to move into the cell, potentially leading to cell swelling or even bursting. On the other hand, a hypertonic solution has a higher concentration of solutes than the inside of the cell, causing water to move out of the cell, leading to cell shrinking or even death.

Isotonic solutions are essential in maintaining cell shape and function, and many biological fluids, such as blood plasma and intravenous fluids, are isotonic to prevent cell damage or death. Therefore, the name of the solution in which the water concentration is the same as that in the cell is an isotonic solution.