Exploring the Solubility Curve of Potassium Nitrate

What is the main objective of the lab?

• To observe the color change of potassium nitrate when heated

• To find the solubility curve of potassium nitrate in water

• To calculate the melting point of potassium nitrate

• To measure the boiling point of potassium nitrate

What is potassium nitrate classified as?

• A covalent compound

• A molecular compound

• A metallic compound

• An ionic compound

How much water is added to each potassium nitrate sample?

• 20 milliliters

• 15 milliliters

• 10 milliliters

• 5 milliliters

What does the concentration of a solution refer to?

• The temperature of the solution

• The ratio of solute to solvent

• The amount of water in the solution

• The ratio of solvent to solute

Which method is not mentioned as a way to increase solubility?

• Stirring the solution

• Decreasing the particle size

• Heating the solution

• Cooling the solution

At what temperature did the solution with 2 grams of potassium nitrate start to crystallize?

• 25 degrees Celsius

• 47 degrees Celsius

• 83 degrees Celsius

• 66 degrees Celsius

What was the saturation point temperature for the solution with 4 grams of potassium nitrate?

• 66 degrees Celsius

• 47 degrees Celsius

• 25 degrees Celsius

• 83 degrees Celsius

At which temperature did crystals start forming in the solution with 6 grams of potassium nitrate?

• 83 degrees Celsius

• 47 degrees Celsius

• 25 degrees Celsius

• 66 degrees Celsius

What is the role of cooling in the experiment?

• To purify the potassium nitrate

• To increase the solubility of potassium nitrate

• To observe crystallization by reducing solubility

• To decrease the reaction time

Which technique was used to observe the salt crystals forming?

• Heating the solution

• Evaporating the water

• Using a microscope

• Cooling the solution