A hypotonic solution is one in which the concentration of solutes is greater inside the cell than outside of it, and a hypertonic solution is one where the concentration of solutes is greater outside the cell than inside it.

In comparing two solutions of unequal solute concentration, the solution with the higher solute concentration is hypertonic, and the solution with the lower solute concentration is hypotonic. Solutions of equal solute concentration are isotonic.

A hypertonic solution has a higher solute concentration than the fluid inside a cell. If a raisin is placed inside a hypotonic solution it will soak up the solution through osmosis and swell , but the cell wall will prevent it from bursting. Hence, it will become turgid i.e, swollen or hard.

A solution will be hypertonic to a cell if its solute concentration is higher than that inside the cell, and the solutes cannot cross the membrane. If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.

What happens when two solution separate by a set selectively permeable membrane reach osmotic equilibrium? -water molecules continue to move from the hypotonic solution to the hypertonic solution. Water molecules move between the two solutions, but there is no net movement of water across the membrane.

In a hypotonic medium, the animal, plant, and Paramecium cells water move into the cells by osmosis. The cells will bulge, swell, but in plant cell NOT BURST, due to a rigid cell wall. Water regulation in freshwater ciliates such as Paramecium is controlled by special organelles called contractile vacuoles.

Solution. If two solutions have unequal osmotic pressures, the more concentrated solution with higher osmotic pressure is said to be hypertonic solution.

So FeCl3 is hypertonic.