The solubility of potassium nitrate at 30 °C is 45 g per 100 g of water. What mass of the salt will saturate 250 g of water at that temperature?

Distinguish between a saturated, an unsaturated and a supersaturated solution.

Define efflorescence, deliquescence and hygroscopy, giving one example of each.

Why is water called a universal solvent?

Define solubility and state two factors that affect the solubility of a solid in water.

Distinguish between a hydrated and an anhydrous salt, and state what happens when blue copper sulphate crystals are heated.

What is a drying agent? Name two and state one substance each cannot dry.