Question

A science teacher dissolved 50 grams of salt in 300 milliliters of water. he set the solution aside until all the water had evaporated.How many grams of salt should have been left in the glass container after the water had evaporated?

Answer 1

When water evaporates, what is left behind is the salt that is dissolved. So you end up with the same amount of salt before and after. Meaning that the answer is 50 grams.

Answer 2

Answer: 50 grams of salt will be left in the glass container after water has been evaporated.

Explanation:

Solution is defined as the mixture which contains both solute and solvent.

Solute is defined as the substance which is present in smaller proportion in a solution.

Solvent is defined as the substance which is present in larger proportion in a solution.

As we know, density of water is 1 g/mL. So, the mass of water will be equal to its volume.

Relationship between density, mass and volume is given by:

$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$

Mass of water = 300 g

We are given:

A solution having 50 grams of salt and 300 g of water.

As, we heat the solution, all of the solvent gets evaporated and none of the solute disappeared. Thus, the amount of salt remained will be equal to the initial amount of salt.

Hence, 50 grams of salt will be left in the glass container after water has been evaporated.