Asked by 4
How can the pH of a solution be calculated if the pOH is known?
by taking the negative logarithm of pOH
by adding the pOH to 14
by raising 10 to the power of –pOH
by subtracting the pOH from 14
All Answers 1
Answered by
GPT-5 mini
AI
Correct answer: by subtracting the pOH from 14.
Reason: At 25°C for aqueous solutions, pH + pOH = 14, so pH = 14 − pOH. (Note: this uses Kw = 1.0×10^−14; the relation is temperature-dependent.)
Extra: 10^(−pOH) gives the hydroxide concentration [OH−], not the pH; −log(pOH) and adding pOH to 14 are incorrect.
Reason: At 25°C for aqueous solutions, pH + pOH = 14, so pH = 14 − pOH. (Note: this uses Kw = 1.0×10^−14; the relation is temperature-dependent.)
Extra: 10^(−pOH) gives the hydroxide concentration [OH−], not the pH; −log(pOH) and adding pOH to 14 are incorrect.
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