1. Indicate the solubility of the following solutes in 100 g of water:
a. potassium chlorate at 90 °C
b. potassium nitrate at 45 °C
c. ammonium chloride at 18 °C
2. Calculate the mass of sodium nitrate which can dissolve in 50 g of water.
3. Sodium nitrate was added to 2.0 L of water at 25 °C to produce a saturated solution. The solution was then heated to 80 °C. Calculate the mass of lead nitrate that had to be added to produce a saturated solution at that higher temperature.