Final answer:
When 25 g of NaCl is dissolved in 100 g of water at 30 degrees C, a saturated solution is formed.
Step-by-step explanation:
When 25 g of NaCl is dissolved in 100 g of water at 30 degrees C, a saturated solution is formed.
In a saturated solution, the solvent (water in this case) has dissolved as much of the solute (NaCl) as it can at that temperature. In this case, all 25 g of NaCl dissolves in the 100 g of water, so the solution is saturated.
This means that if any more NaCl is added to the solution, it will not dissolve and will remain undissolved at the bottom.