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If a solution has a pOH of 11.76 at 25 degrees Celsius, what is its pH?
A14.00
B11.76
C2.24
D25.76
Answer & Solution
Correct answer: C. 2.24
1. At 25 degrees Celsius, pH + pOH = 14.
2. Rearrange to pH = 14 - pOH.
3. pH = 14 - 11.76 = 2.24.
4. Therefore pH = 2.24; choosing 11.76 wrongly equates pH with the given pOH.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 10 Types of Chemical Reactions "Relationship between pH and pOH", p.157_
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