A student has a solution of sodium nitrate and believes it is saturated. Which statement provides the best evidence that the solution is saturated?
A) When more water is added, the appearance of the solution doesn't change.
B) When some of the water evaporates, all of the sodium nitrate remains dissolved.
C) When a small amount of sodium nitrate is added, a large amount precipitates from the solution.
D) When additional sodium nitrate is added, it all settles to the bottom of the container.
E) When the temperature of the solution is increased, additional sodium nitrate can be dissolved.
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