3.1.12.2 pH and Kw

    Cards (70)

    • The pH scale ranges from 0 to 14.
      True
    • What does Kw quantify?
      Water equilibrium
    • If [H+] increases, what happens to [OH-]?
      It decreases
    • What is the value of Kw at 25°C?
      1.0 x 10^-14
    • What is the equation relating pH, pOH, and Kw?
      pH + pOH = 14
    • What does pOH measure in a solution?
      Alkalinity
    • What is the formula to calculate pH from hydrogen ion concentration [H+]?
      pH = -log10[H+]
    • What is the pH of pure water?
      7
    • Match the term with its definition:
      pH ↔️ Measures acidity or alkalinity
      pOH ↔️ Measures alkalinity
      Kw ↔️ Ion product constant for water
    • What is the formula to calculate pOH from hydroxide ion concentration [OH-]?
      pOH = -log10[OH-]
    • The relationship between pH and pOH is given by the equation: pH + pOH = 14
    • Match the variable in the Arrhenius equation with its meaning:
      Kw(T) ↔️ Ion product constant at temperature T
      Kw(25°C) ↔️ Ion product constant at 25°C
      ΔH° ↔️ Standard enthalpy change
      R ↔️ Ideal gas constant
      T ↔️ Temperature in Kelvin
    • The Kw of water is used to determine the pH of a solution and the relative concentrations of H+ and OH-
    • Both pH and Kw are essential for understanding and optimizing chemical reactions.

      True
    • What is the value of Kw at 25°C?
      1.0 x 10^-14
    • The value of Kw is [H+][OH-] = 1.0 x 10^-14
    • What is the formula to calculate pH from [H+]?
      pH = -log10[H+]
    • pOH is calculated using the formula: pOH = -log10[OH-], where [OH-] is the hydroxide ion concentration
    • Kw at 35°C is approximately 1.53 x 10^-14
    • What does pH indicate in a solution?
      Acidity or alkalinity
    • Match the condition with its corresponding pH and pOH ranges:
      Acidic ↔️ pH < 7, pOH > 7
      Neutral ↔️ pH = 7, pOH = 7
      Alkaline ↔️ pH > 7, pOH < 7
    • A solution with a [H+] of 1.0 x 10^-3 M has a pH of 3.
    • What is the pH of a solution with [H+] = 1.0 x 10^-3 M?
      3
    • What is the modified Arrhenius equation used for in the context of Kw calculations?
      Calculating Kw at different temperatures
    • Match the pH value with the corresponding condition:
      pH < 7 ↔️ Acidic
      pH = 7 ↔️ Neutral
      pH > 7 ↔️ Alkaline
    • At 25°C, the value of Kw is 1.0 x 10^-14.

      True
    • The pH scale ranges from 0 to 14.
    • In pure water, [H+] = [OH-].

      True
    • Match the condition with the corresponding pH and pOH values:
      Neutral ↔️ pH = 7, pOH = 7
      Acidic ↔️ pH < 7, pOH > 7
      Alkaline ↔️ pH > 7, pOH < 7
    • Kw is the ion product constant for water, defined as Kw = 1.0 x 10^-14
    • The pH formula tells us how acidic or alkaline a solution is based on the concentration of hydrogen ions
    • What is the numerical value of Kw at 25°C?
      1.0 x 10^-14
    • What is the formula to calculate pH from hydrogen ion concentration [H+]?
      pH = -log10[H+]
    • What equation relates pH, pOH, and Kw?
      pH + pOH = 14
    • In acidic conditions, pH is less than 7 and pOH is greater than 7.
      True
    • What does pH indicate about a solution?
      Acidity or alkalinity
    • The pH scale ranges from 0 to 14, where 7 is neutral.

      True
    • What does pH measure?
      Acidity or alkalinity
    • If [H+] increases, [OH-] must decrease to maintain Kw.

      True
    • Match the condition with its corresponding pH range:
      Neutral ↔️ pH = 7
      Acidic ↔️ pH < 7
      Alkaline ↔️ pH > 7
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