Which of the following statements is NOT true regarding a saturated solution?

A saturated solution is one in which the maximum amount of solute has been dissolved at a given temperature and pressure. This means that the solution has reached a point where no more solute can be dissolved; hence, additional solute will not dissolve and will remain undissolved. This is reflected in the first two statements: once saturation is achieved, any extra solute will indeed settle at the bottom of the container, confirming that the solution cannot dissolve more solute.

The concentration of solute in a saturated solution is at its highest possible level for that specific temperature and pressure, making the third statement true as well. However, the assertion that a saturated solution dissolves all additional solute efficiently is incorrect. In fact, the defining characteristic of a saturated solution is that it cannot dissolve more solute, leading to inefficiency in dissolving any additional amounts. Thus, by understanding the nature of saturated solutions, it's clear why the correct statement identifies the misunderstanding about their behavior regarding additional solute.