What is the pH of 0.001 mol dm ?3 solution of sodium hydroxide?

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What is the pH of 0.001 mol dm?3 solution of sodium hydroxide?

  • A) 14
  • B) 13
  • C) 12
  • D) 11

Correct Answer: D) 11

Explanation

[H+] [OH-] = 10-14 [H+] = 10-14/[OH-] = 10-14/(1 * 10-3) = 10-11 pH = -Log10[H+] = - Log10[10-11] = - 1 * -11 Log10[10-11] = 1 = -1 * -11 * 1 = 11
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