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

pH of Strong Acids and Bases

GOB Chemistry

10. Acids and Bases

pH of Strong Acids and Bases

Previous problemNext problem

1:58 minutes

Problem 107b

Textbook Question

Determine each of the following for a 0.050 M KOH solution:
b. pH

Verified step by step guidance

Step 1: Recognize that KOH is a strong base, meaning it completely dissociates in water. The concentration of OH⁻ ions in the solution will be equal to the concentration of KOH, which is 0.050 M.

Step 2: Use the relationship between pOH and the hydroxide ion concentration [OH⁻]. The formula is:

pOH = - \log ({OH}_{-})

. Substitute [OH⁻] = 0.050 M into the formula.

Step 3: Calculate the pOH value using the logarithmic expression. This step involves taking the negative logarithm of 0.050.

Step 4: Use the relationship between pH and pOH to find the pH. The formula is:

pH = 14 - pOH

. Substitute the calculated pOH value into this formula.

Step 5: Simplify the expression to determine the pH of the solution. This will give you the final pH value for the 0.050 M KOH solution.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above

Video duration:

Play a video:

Was this helpful?

Key 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 neutral, below 7 indicates acidity, and above 7 indicates basicity. The scale is logarithmic, meaning each whole number change represents a tenfold change in hydrogen ion concentration.

Strong Bases

Strong bases, like potassium hydroxide (KOH), completely dissociate in water to produce hydroxide ions (OH-). This complete dissociation means that the concentration of hydroxide ions in a solution directly corresponds to the concentration of the base, allowing for straightforward calculations of pH.

Calculating pH from pOH

To find the pH of a solution, one can first calculate the pOH, which is derived from the concentration of hydroxide ions. The relationship between pH and pOH is given by the equation pH + pOH = 14. Thus, knowing the pOH allows for easy conversion to pH, essential for determining the acidity or basicity of the solution.

Watch next

Master Strong Acids and Bases with a bite sized video explanation from Jules

Start learning