Practice Solution in Chemistry
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A homogeneous mixture formed when one or more solutes are completely dissolved in a solvent at the molecular level, resulting in a uniform composition throughout that cannot be separated by filtration.
One substance completely mixed into another—you can't see separate parts.
Example 1
easyDefine a solution and identify its two main components. Explain what makes a solution different from other types of mixtures.
Example 2
mediumDescribe the differences among unsaturated, saturated, and supersaturated solutions. How can you experimentally distinguish between them?
Example 3
mediumYou dissolve 20 g of salt in 480 g of water. Find the mass percent concentration.
Example 4
mediumA student dissolves 35 g of NaCl in 100 g of water at 25°\text{C}. The solubility of NaCl at 25°\text{C} is 36\,\text{g per 100 g water}. Is this solution saturated, unsaturated, or supersaturated?
Example 5
hardA student prepares a solution by dissolving 80 g of \text{KNO}_3 in 100 g of water at 60°\text{C} (solubility = 106\,\text{g/100 g}), then slowly cools it to 20°\text{C} (solubility = 31\,\text{g/100 g}). How many grams of \text{KNO}_3 will crystallize out?