Which of the following mixtures of KCl in water is a saturated solution and which is an unsaturated solution;

1)100g of KCl in 100mL of H2O at 40°C
2)50g of KCl in 100mL of H2O at 70°C
3) 120g of KCl in 100mL of H2O at 60°C

My data is:

Temperature82°C 58°C 39°C 18°C 16°C
Solubility(g/100mL)50 42.86 37.5 33.3 30

At temperature 82°C the solubility is 50
At temperature 58°C the solubility is 42.86
At temperature 39°C the solubility is 37.5
At temperature 18°C the solubility is 33.3
At temperature 16°C the solubility is 30

Can't you read this from the data you plotted?

To determine whether a solution is saturated or unsaturated, we need to compare the amount of solute (in this case, KCl) dissolved in the solution to the maximum amount of solute that can dissolve at a given temperature. If the amount of solute dissolved is equal to or less than the maximum solubility, the solution is saturated. If the amount of solute dissolved is less than the maximum solubility, the solution is unsaturated.

Let's analyze each given mixture of KCl in water:

1) 100g of KCl in 100mL of H2O at 40°C:
First, we check the maximum solubility of KCl at 40°C, which is not given in the data. Since the data provided only gives solubility up to 82°C, we need to interpolate between the given values to estimate the solubility at 40°C. Based on the given data, the solubility decreases as temperature decreases. Therefore, we can estimate the solubility at 40°C to be between 50g/100mL and 42.86g/100mL. Since the amount of solute (100g of KCl) is greater than both of these values, the solution is unsaturated.

2) 50g of KCl in 100mL of H2O at 70°C:
Using the provided data, we can see that at 70°C, the solubility of KCl is 42.86g/100mL. In this case, the amount of solute (50g of KCl) is less than the solubility, so the solution is unsaturated.

3) 120g of KCl in 100mL of H2O at 60°C:
According to the given data, the solubility of KCl at 60°C is 37.5g/100mL. Since the amount of solute (120g of KCl) is greater than the solubility, the solution is saturated.

To summarize:
1) 100g of KCl in 100mL of H2O at 40°C: Unsaturated
2) 50g of KCl in 100mL of H2O at 70°C: Unsaturated
3) 120g of KCl in 100mL of H2O at 60°C: Saturated