What happens when you put a boiled egg in pure water and then concentrated salt solution?

When a boiled egg is placed in pure water, it will experience osmosis, which is the movement of water molecules from an area of lower solute concentration to an area of higher solute concentration. In this case, the pure water has a lower solute concentration than the egg, so water molecules will move into the egg. This will cause the egg to swell and become softer.

In concentrated salt solution:

When a boiled egg is placed in a concentrated salt solution, the opposite will occur. The salt solution has a higher solute concentration than the egg, so water molecules will move out of the egg and into the solution. This will cause the egg to shrink and become harder.

The difference in the egg's texture is due to the different concentrations of solutes in the water and salt solution. In pure water, the low solute concentration allows water molecules to move into the egg, causing it to swell. In concentrated salt solution, the high solute concentration draws water molecules out of the egg, causing it to shrink.