Table of contents

1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

10. Acids and Bases

The pH Scale

GOB Chemistry

10. Acids and Bases

The pH Scale

Previous problemNext problem

Struggling with GOB Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following statements about aqueous solutions is/are true?

For an basic solution the concentration of H₃O⁺ is greater than the concentration of OH^-.

The pH of a neutral aqueous solution is 7.00 at all temperatures.

An acidic solution under normal conditions has a pH value less than 7.00.

If the concentration of H₃O⁺ decreases then the concentration of OH^- will also decrease.

The pH of aqueous solutions is less than 7.

Previous problemNext problem

Verified step by step guidance

Understand the nature of aqueous solutions: Aqueous solutions are those where water is the solvent. The pH scale is used to determine the acidity or basicity of a solution, with 7 being neutral, below 7 acidic, and above 7 basic.

Analyze the first statement: 'For a basic solution, the concentration of H3O+ is greater than the concentration of OH-.' In a basic solution, the concentration of OH- is actually greater than that of H3O+, so this statement is false.

Evaluate the second statement: 'The pH of a neutral aqueous solution is 7.00 at all temperatures.' This is incorrect because the pH of pure water is 7.00 only at 25°C. At other temperatures, the pH can vary slightly due to changes in the ionization of water.

Consider the third statement: 'An acidic solution under normal conditions has a pH value less than 7.00.' This statement is true, as acidic solutions have a higher concentration of H3O+ ions, resulting in a pH less than 7.

Examine the fourth statement: 'If the concentration of H3O+ decreases then the concentration of OH- will also decrease.' This is false because, according to the water ion product (Kw), if the concentration of H3O+ decreases, the concentration of OH- must increase to maintain the constant value of Kw at a given temperature.