A 68.4-g sample of potassium chloride was added to 200.0 g of water at 20 C. Is the solution saturated, unsaturated, or supersaturated?
It is saturated
look at the solubility chart. Look for the KCl curve at 20C. Where is 34.1g/100gwater point in relation to the saturation line? Above, on the line, or below?
The sample of potassium chloride is a saturated solution.
To determine if the solution is saturated, unsaturated, or supersaturated, we need to compare the amount of potassium chloride that has dissolved in the water at 20°C to the maximum solubility of potassium chloride at that temperature.
The solubility of potassium chloride at 20°C is approximately 34.7 g/100 g of water.
First, we convert the mass of water to grams:
200.0 g of water
Next, we compare the amount of potassium chloride that has dissolved to the maximum solubility at that temperature:
Mass of potassium chloride dissolved = 68.4 g
Maximum solubility of potassium chloride in 200.0 g of water = (34.7 g/100 g) * 200.0 g = 69.4 g
Since the mass of potassium chloride dissolved (68.4 g) is less than the maximum solubility (69.4 g), the solution is unsaturated.