Question:
Which of the following has the highest pH?
Which of the following has the highest pH?
Show Hint
The strongest base gives the highest hydroxide concentration and so the highest pH.
Updated On: Nov 12, 2026
- Distilled water
- \(1\text{M}\text{NH}_{3}\)
- \(1\text{M}\text{NaOH}\)
- \(1\text{M}\text{CH}_{3}\text{COOH}\)
Show Solution
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
The more basic the solution, the higher its pH.
Step 2: Compare each
Distilled water has \(pH=7\). Acetic acid is a weak acid, so its pH is below 7. 1 M ammonia is a weak base with pH about 11 to 12.
Step 3: Strong base
1 M NaOH is a strong base that dissociates completely, so \([\text{OH}^-]=1\) M, \(pOH=0\) and \(pH=14\).
Step 4: Compare the options
NaOH has the highest pH, option (C).
Final Answer:
One molar sodium hydroxide has the highest pH. \[ \boxed{\text{(C) }1\text{ M NaOH}} \]
The more basic the solution, the higher its pH.
Step 2: Compare each
Distilled water has \(pH=7\). Acetic acid is a weak acid, so its pH is below 7. 1 M ammonia is a weak base with pH about 11 to 12.
Step 3: Strong base
1 M NaOH is a strong base that dissociates completely, so \([\text{OH}^-]=1\) M, \(pOH=0\) and \(pH=14\).
Step 4: Compare the options
NaOH has the highest pH, option (C).
Final Answer:
One molar sodium hydroxide has the highest pH. \[ \boxed{\text{(C) }1\text{ M NaOH}} \]
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