Use the following table:
A solution containing 80. g of KCl in 200. g of H₂O at 50 °C is cooled to 20 °C.
a. How many grams of KCl remain in solution at 20 °C?

Question

Use the following table:

Table showing solubility of KCl, NaNO3, and sugar in water at 20 °C and 50 °C.

A solution containing 80. g of KCl in 200. g of H₂O at 50 °C is cooled to 20 °C.

a. How many grams of KCl remain in solution at 20 °C?

Accepted Answer

Welcome back. Everyone refer to the information given in the table below. A solution was prepared by dissolving 350 g of lithium chlorine and 400 g of water at 60 Celsius. If the solution was cool to 30 degrees Celsius and then agitated the mass of lithium chlorine left in the solution. So we're given in our table our solubility tart for lithium chlorine, we're at 30 degrees Celsius. We have 62.7 g per 100 g of water. And then at 60 degrees Celsius, we have 96.9 g of lithium chlorate per 100 g of water. So given our solubility at 30 degrees Celsius for 62.7 g of lithium chlorine in 100 g of water, we're going to set this proportion equal to our unknown solubility in grams of lithium chlorine in 400 g of water at 60 degrees Celsius or sorry at 30 degrees Celsius we need to solve for X being our solubility of lithium chlorine. So we're going to need to cross multiply so that we have the following equation where we have X grams of lithium chlorine multiplied by 100 g of water set equal to 25,080 g of lithium chlorine hydrate. In our next line, we're going to divide both sides by 100 g of water. So that that term will cancel out on the left. So on the right, we can cancel out water. And in our last line, we would be left with our solubility of lithium chlorine at 30 degrees Celsius equal to about 251 g of lithium chlorine. And this would be our solubility of lithium chlorine in g of solution at 30 degrees Celsius. And also represents our mass left of lithium chlorine 251 g.

Use the following table:

A solution containing 80. g of KCl in 200. g of H₂O at 50 °C is cooled to 20 °C.
a. How many grams of KCl remain in solution at 20 °C?

Verified video answer for a similar problem:

Key Concepts

Solubility

Temperature Effects on Solubility

Saturation Point