What mass of solute will dissolve in 100 grams of water at the following temperatures? KCl at 80ºC

NaCl at 90ºC

NaNO3 at 10ºC

D) NaNO3 at 10 °C

Explanation:

In this case, to know this, we need to watch the solubility curve of each compound to know which one is saturated or unsaturated in this case.

As you can see in the curve attached, let's analyze first what is an unsaturated solution.

An unsaturated solution is a solution where the quantity of solvent is in excess and the solute is completely dissolved in solution leaving no remains. This depends on the temperature of course. The solubility of one compound vary with the increase or decrease of temperature.

As you can see in the graph attached, what happens to the KCl? we can see that a 40 °C, you just need around g of solute to be dissolved, and be saturated so, this is not the correct choice.

If you watch NaCl, has similar behavior. You just need about 35 g of solute to be saturated.

Finally, the KNO₃ just need 60 g of solute to be dissolved in the solution, completely.

In the case of NaNO 10°C, we can see that at 40 °C it's not touching the curve, so we can assume that this is an unsaturated solution and it would be the correct choice.

Explanation: