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 88c
Determine the pH for the following solutions:
c. [H3O+] = 0.0001 M
Verified step by step guidance1
Step 1: Recall the formula for calculating pH, which is given by: . This formula relates the hydronium ion concentration to the pH of the solution.
Step 2: Identify the given value for the hydronium ion concentration, , which is 0.0001 M.
Step 3: Substitute the given value of into the pH formula: .
Step 4: Simplify the logarithmic expression. Recall that simplifies to -4, so becomes 4.
Step 5: Conclude that the pH of the solution is equal to 4. This indicates that the solution is acidic, as pH values less than 7 correspond to acidic solutions.
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53sKey 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 basicity of a solution, ranging from 0 to 14. A pH of 7 is considered neutral, while values below 7 indicate acidity and values above 7 indicate alkalinity. The scale is logarithmic, meaning each whole number change represents a tenfold change in hydrogen ion concentration.
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The pH Scale
Hydronium Ion Concentration
Hydronium ions (H₃O⁺) are formed when an acid donates a proton to water. The concentration of hydronium ions in a solution directly influences its pH. For example, a higher concentration of H₃O⁺ results in a lower pH, indicating a more acidic solution.
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Calculating pH
To calculate pH from hydronium ion concentration, the formula pH = -log[H₃O⁺] is used. This formula allows for the conversion of the molarity of hydronium ions into a pH value. For instance, if [H₃O⁺] = 0.0001 M, the pH can be calculated as 4, indicating an acidic solution.
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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
Solution X has a pH of 9.0, and solution Y has a pH of 7.0.
a. Which solution is more acidic?
Textbook Question
Identify each of the following as an acid, base, or salt, and give its name:
e. H2CO3
Textbook Question
Sometimes, during stress or trauma, a person can start to hyperventilate. Then the person might breathe into a paper bag to avoid fainting.
b. How does breathing into a paper bag help return blood pH to normal?
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