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pH and pOH of Strong Acids and Bases

AP Chemistry· difficulty 4/5

What is the pH of 1.0×10−81.0\times10^{-8} M HCl?

  • A

    12

  • B

    8 (just −log⁡[H+]-\log[H^+])

  • C

    6

  • D

    Just below 7 (water autoionization adds H+^+)

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Explanation

For very dilute strong acid, water's autoionization contributes ~10−710^{-7} M H+^+. Total [H+^+] ≈ 1.05×10−71.05\times10^{-7}, pH ≈ 6.98 (slightly less than 7, slightly acidic).

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