Question:
An aqueous solution of which of the following has the highest pH value
An aqueous solution of which of the following has the highest pH value
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A higher concentration of a strong base gives a higher pH (more basic).
Updated On: Apr 24, 2026
- 0.10 M HCl
- 0.50 M H\(_2\)SO\(_4\)
- 0.10 M NaOH
- 0.5 M HCl
- 0.01 M NaOH
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
pH is a measure of hydrogen ion concentration. Higher pH means more basic (lower H+ concentration). We need the solution with the highest pH among acids and bases.
Step 2: Detailed Explanation:
Acids have pH < 7, bases have pH > 7. So the answer must be a base. Compare the two bases: 0.10 M NaOH and 0.01 M NaOH. NaOH is a strong base, so it dissociates completely. pOH = -log[OH-]. pH = 14 - pOH. For 0.10 M NaOH: [OH-] = 0.1 M, pOH = 1, pH = 13.
For 0.01 M NaOH: [OH-] = 0.01 M, pOH = 2, pH = 12. 0.10 M NaOH has a higher pH.
Step 3: Final Answer:
0.10 M NaOH has the highest pH value.
pH is a measure of hydrogen ion concentration. Higher pH means more basic (lower H+ concentration). We need the solution with the highest pH among acids and bases.
Step 2: Detailed Explanation:
Acids have pH < 7, bases have pH > 7. So the answer must be a base. Compare the two bases: 0.10 M NaOH and 0.01 M NaOH. NaOH is a strong base, so it dissociates completely. pOH = -log[OH-]. pH = 14 - pOH. For 0.10 M NaOH: [OH-] = 0.1 M, pOH = 1, pH = 13.
For 0.01 M NaOH: [OH-] = 0.01 M, pOH = 2, pH = 12. 0.10 M NaOH has a higher pH.
Step 3: Final Answer:
0.10 M NaOH has the highest pH value.
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