Question

Tom adds solid sodium hydroxide to a flask of water at room temperature. After he stirs the water, some of the

sodium hydroxide dissolves, however, a small amount of sodium hydroxide still remains at the bottom of the flask.
He heats the flask of sodium hydroxide and water for 10 minutes, and the sodium hydroxide on the bottom of the
flask disappears. How does heating the water cause the remaining sodium hydroxide to disappear?

Answer 1

Answer: It has a lower boiling/melting point than the water