12B Predicting Solubilities

If 40 g of KCl is dissolved in 100 g of water at 60°C, is the solution saturated, unsaturated, or supersaturated?

• unsaturated
• saturated
• concentrated
• supersaturated

If 70 g of KCl is dissolved in 100 g of water at 80°C, is the solution saturated, unsaturated, or supersaturated?

• unsaturated
• saturated
• concentrated
• supersaturated

What happens to the solubility of KCl as temperature increases?

• Solubility increases

• Solubility decreases

• Solubility stays the same

Using the solubility curve, at what mass of KCl would the solution be considered saturated at 70 °C?

• 40 g

• 44 g

• 49 g

• 54 g

At approximately what temperature will 55 g of KCl dissolve in 100 g of water? °C

• 60 °C

• 90 °C

• 75 °C

• 80 °C

Which salt does not show increased solubility as temperature increases?

• NaNO₃

• Ce₂(SO₄)₃

• K₂Cr₂O₇

• KNO₃

Using the solubility curve, at what mass of NaNO₃ would the solution be considered saturated at 10 °C?

• 90 g

• 80 g

• 85 g

• 70 g

Using the solubility curve provided, predict the mass, in grams, of KNO3 that would dissolve in 400 g of water at a temperature of 10 °C.

• 80 g

• 20 g

• 60 g

• 40 g

Using the solubility curve, predict the mass of crystals produced when 80g of potassium dichromate K₂Cr₂O₇ is added to 100g of water at 50 °C.

• 60 g

• 45 g

• 40 g

• 51 g

50 g of potassium nitrate (KNO3) is dissolved in 100 g water at 40 °C. What mass of KNO3 crystals will form if the temperature is reduced to 20 °C? You will need to refer to the KNO3 solubility curve.

• 20 g

• 15 g

• 25 g

• 30 g