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The pH Scale quiz

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  • What is the typical range of the pH scale under normal conditions?
    The pH scale typically ranges from 0 to 14 when the concentrations of H+ and OH- are less than 1 Molar.
  • How is pH mathematically defined in terms of hydrogen ion concentration?
    pH is defined as the negative logarithm of the hydrogen ion concentration: pH = -log[H+].
  • What does pOH represent and how is it calculated?
    pOH is the negative logarithm of the hydroxide ion concentration: pOH = -log[OH-].
  • What is the relationship between pH and pOH in aqueous solutions?
    The relationship is pH + pOH = 14.
  • What is the ion product constant for water (Kw) at 25°C?
    Kw is 1.0 x 10^-14 at 25 degrees Celsius.
  • What are the concentrations of H+ and OH- ions in a neutral solution at 25°C?
    Both H+ and OH- concentrations are 1.0 x 10^-7 Molar at neutral pH.
  • How can you calculate [H+] if you know the pH?
    You calculate [H+] by taking the antilog: [H+] = 10^-pH.
  • How can you calculate [OH-] if you know the pOH?
    You calculate [OH-] by taking the antilog: [OH-] = 10^-pOH.
  • What does a pH greater than 7 indicate about a solution?
    A pH greater than 7 indicates the solution is basic, with [OH-] greater than [H+].
  • What does a pH less than 7 indicate about a solution?
    A pH less than 7 indicates the solution is acidic, with [H+] greater than [OH-].
  • What does a pH of exactly 7 indicate about the solution?
    A pH of 7 indicates a neutral solution where [H+] equals [OH-].
  • What happens to [H+] and [OH-] as pH increases?
    As pH increases, [H+] decreases and [OH-] increases, making the solution more basic.
  • If [H+] is greater than 1 M, what can you say about the pH?
    If [H+] is greater than 1 M, the pH will be less than 0.
  • If [OH-] is greater than 1 M, what can you say about the pH?
    If [OH-] is greater than 1 M, the pH will be greater than 14.
  • How are pH and pOH related to the ion product constant for water (Kw)?
    Since Kw = [H+][OH-], and pH + pOH = 14, knowing sopH or pOH allows calculation of the other and the ion concentrations.