Textbook Question
A 0.205 M NaOH solution is used to titrate 20.0 mL of a solution of H2SO4. If 45.6 mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution?
H2SO4(aq) + 2NaOH(aq) → 2H2O(l) + Na2SO4
Ch.10 Acids and Bases and Equilibrium
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249
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Table of contents
- Ch.1 Chemistry in Our Lives19
- Ch.2 Chemistry and Measurements80
- Ch.3 Matter and Energy53
- Ch.4 Atoms and Elements58
- Ch.5 Nuclear Chemistry42
- Ch.6 Ionic and Molecular Compounds57
- Ch.7 Chemical Quantities and Reactions38
- Ch.8 Gases30
- Ch.9 Solutions50
- Ch.10 Acids and Bases and Equilibrium64
- Ch.11 Introduction to Organic Chemistry: Hydrocarbons77
- Ch.12 Alcohols, Thiols, Ethers, Aldehydes, and Ketones82
- Ch.13 Carbohydrates54
- Ch.14 Carboxylic Acids, Esters, Amines, and Amides91
- Ch.15 Lipids61
- Ch.16 Amino Acids, Proteins, and Enzymes84
- Ch.17 Nucleic Acids and Protein Synthesis86
- Ch.18 Metabolic Pathways and ATP Production73
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Not the one you use?Change textbook
Chapter 10, Problem 94a
Solution X has a pH of 9.0, and solution Y has a pH of 7.0.
a. Which solution is more acidic?
Verified step by step guidance1
Understand the pH scale: The pH scale ranges from 0 to 14, where a pH less than 7 indicates an acidic solution, a pH of 7 is neutral, and a pH greater than 7 indicates a basic (alkaline) solution.
Compare the pH values of the two solutions: Solution X has a pH of 9.0, which is greater than 7, making it basic. Solution Y has a pH of 7.0, which is neutral.
Recall that acidity increases as the pH decreases. A lower pH corresponds to a higher concentration of hydrogen ions \( [H^+] \).
Since solution Y has a lower pH (7.0) compared to solution X (9.0), solution Y is closer to the acidic range of the pH scale.
Conclude that solution Y is more acidic than solution X because it has a lower pH value.
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Video duration:
1mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
pH Scale
The pH scale measures the acidity or alkalinity of a solution, ranging from 0 to 14. A pH of 7 is considered neutral, values below 7 indicate acidity, and values above 7 indicate alkalinity. Thus, the lower the pH value, the more acidic the solution.
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02:33
The pH Scale
Acidic vs. Alkaline Solutions
Acidic solutions have a higher concentration of hydrogen ions (H+) compared to hydroxide ions (OH-), leading to a pH below 7. Conversely, alkaline solutions have more hydroxide ions, resulting in a pH above 7. Understanding this distinction is crucial for determining the relative acidity of solutions.
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01:39Solutions
Comparative pH Analysis
To compare the acidity of two solutions, one can directly assess their pH values. In this case, solution X with a pH of 9.0 is alkaline, while solution Y with a pH of 7.0 is neutral. Therefore, solution Y is more acidic than solution X, as it is closer to the acidic end of the pH scale.
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Related Practice
Textbook Question
Solution A has a pH of 4.0, and solution B has a pH of 6.0.
a. Which solution is more acidic?
Textbook Question
Identify each of the following as an acid, base, or salt, and give its name:
a. H3PO4
Textbook Question
Calculate the volume, in milliliters, of a 0.150 M NaOH solution that will completely neutralize each of the following:
a. 25.0 mL of a 0.288 M HCl solution
Textbook Question
A buffer solution is made by dissolving H3PO4 and NaH2PO4 in water.
a. Write an equation that shows how this buffer neutralizes added acid.
Textbook Question
Determine the pH for the following solutions:
c. [H3O+] = 0.0001 M