Practice Solution in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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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.

One substance completely mixed into another—you can't see separate parts.

Showing a random 20 of 50 problems.

Example 1

easy
Is steel (iron + a little carbon) a solution? Explain in one line.

Example 2

medium
How many grams of NaCl\text{NaCl} (M=58.44 g/molM = 58.44\,\text{g/mol}) are needed to prepare 250 mL250\,\text{mL} of a 0.40 M0.40\,\text{M} solution?

Example 3

easy
Define a solution and identify its two main components. Explain what makes a solution different from other types of mixtures.

Example 4

easy
0.50.5 mol of solute is dissolved in enough water to make 1.01.0 L of solution. What is the molarity?

Example 5

hard
50.050.0 mL of 0.300 M0.300\,\text{M} NaCl is mixed with 150.0150.0 mL of 0.100 M0.100\,\text{M} NaCl. Find the final concentration of Cl−\text{Cl}^-. Assume volumes are additive.

Example 6

medium
Convert a 5.0%5.0\% (w/v) glucose solution to molarity. (M(glucose)=180.16 g/molM(\text{glucose}) = 180.16\,\text{g/mol})

Example 7

challenge
A 2 M solution is diluted by adding water to triple its volume. Then 0.5 L of the diluted solution is taken. How many moles of solute does it contain?

Example 8

easy
In a sugar-water solution, can you see separate sugar particles? Answer yes or no.

Example 9

hard
How would you prepare 500 mL500\,\text{mL} of 0.100 M0.100\,\text{M} H2SO4\text{H}_2\text{SO}_4 from a 1.00 M1.00\,\text{M} stock?

Example 10

medium
What mass of KNO3\text{KNO}_3 is dissolved in 250250 g of a solution that is 20%20\% KNO3\text{KNO}_3 by mass?

Example 11

challenge
A solution is made by mixing 100 mL of 0.2 M solution with 100 mL of 0.6 M solution of the same solute. Find the final molarity.

Example 12

easy
In a sugar–water solution, identify the solute and solvent.

Example 13

easy
Name the solvent in a solution that is 95% water and 5% acetic acid by volume.

Example 14

medium
A solution is 15% solute by mass. How much solute is in 200 g of solution?

Example 15

challenge
How many grams of NaOH (molar mass 40 g/mol) are needed to make 500 mL of 0.25 M solution?

Example 16

challenge
Mix 25.0 mL25.0\,\text{mL} of 0.200 M0.200\,\text{M} HCl with 50.0 mL50.0\,\text{mL} of 0.100 M0.100\,\text{M} NaOH. What is the pH of the resulting solution? Assume volumes are additive.

Example 17

easy
Carbonated water is carbon dioxide gas dissolved in water. What is the solute?

Example 18

medium
0.5 mol of NaCl is dissolved to make 2 L of solution. What is the molarity?

Example 19

medium
A student dissolves 3535 g of NaCl in 100100 g of water at 25°C25°\text{C}. The solubility of NaCl at 25°C25°\text{C} is 36 g per 100 g water36\,\text{g per 100 g water}. Is this solution saturated, unsaturated, or supersaturated?

Example 20

medium
A solution contains 25 g solute in 75 g solvent. What is the mass percent of solute?
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