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The pH Scale quiz #1

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  • What is the range of pH values in a basic solution?
    A basic solution has a pH greater than 7, typically up to 14 under standard conditions.
  • What does it mean to have a neutral pH?
    A neutral pH means the solution has a pH of 7, where the concentrations of H+ and OH- ions are equal.
  • According to the pH scale, how are solutions classified as acidic, neutral, or basic?
    On the pH scale, solutions with pH less than 7 are acidic, pH equal to 7 is neutral, and pH greater than 7 is basic.
  • What is the value of Kw at 25 °C?
    At 25 °C, the value of Kw (the ion product of water) is 1.0 × 10⁻¹⁴.
  • Why does the pH scale generally range from 0 to 14 in aqueous solutions?
    The pH scale ranges from 0 to 14 in aqueous solutions at 25 °C because this corresponds to the range of H+ concentrations possible in water, based on the ion product constant of water (Kw).
  • Which substances are on the basic side of the pH scale?
    Substances with a pH greater than 7, such as ammonia or bleach, are on the basic side of the pH scale.
  • What does the pH scale indicate?
    The pH scale indicates the acidity or basicity of an aqueous solution.
  • On the pH scale, what does a value above 7 represent?
    A pH value above 7 represents a basic (alkaline) solution.
  • What does the pH scale measure?
    The pH scale measures the concentration of hydrogen ions (H+) in an aqueous solution.
  • On the pH scale, numbers less than 7 indicate a(n):
    Numbers less than 7 on the pH scale indicate an acidic solution.
  • The pH scale is mainly used for what purpose in chemistry?
    The pH scale is mainly used to classify and quantify the acidity or basicity of aqueous solutions.
  • The pH scale is a mathematical indicator of the:
    The pH scale is a mathematical indicator of the hydrogen ion concentration in a solution.
  • What does pH measure in a solution?
    pH measures the concentration of hydrogen ions (H+) in a solution.
  • A solution with a pH of 7 is classified as what?
    A solution with a pH of 7 is classified as neutral.
  • What is the pH of a basic solution?
    A basic solution has a pH greater than 7.
  • What does the pH scale measure?
    The pH scale measures the acidity or basicity of aqueous solutions by indicating the concentration of hydrogen ions (H+).
  • When acids are added to a solution, what happens to the pH?
    When acids are added to a solution, the pH decreases.
  • What is measured by the pH scale?
    The pH scale measures the concentration of hydrogen ions (H+) in a solution.
  • A substance with a pH of 2 is considered what?
    A substance with a pH of 2 is considered strongly acidic.
  • How does hydrogen ion concentration relate to pH?
    The lower the pH, the higher the hydrogen ion concentration.
  • What is the normal pH range of the skin?
    The normal pH range of the skin is typically between 4.5 and 5.5.
  • What does a decrease of pH by 3 imply about hydrogen ion concentration?
    A decrease of pH by 3 implies the hydrogen ion concentration increases by 1,000 times.
  • A substance with a pH of 6 is called what?
    A substance with a pH of 6 is called slightly acidic.
  • What is the range of the pH scale under normal conditions?
    The pH scale ranges from 0 to 14 under normal conditions.
  • What do we call a solution with a pH of 7?
    A solution with a pH of 7 is called neutral.
  • A solution with a pH of 5 is considered what?
    A solution with a pH of 5 is considered acidic.
  • On the pH scale, which value is considered neutral?
    A pH value of 7 is considered neutral.
  • Which pH value indicates the most basic solution?
    A pH value of 14 indicates the most basic solution under normal conditions.
  • What does pH measure in a solution?
    pH measures the concentration of hydrogen ions (H+) in a solution.
  • What is the pH level for most human cells?
    The pH level for most human cells is close to neutral, around 7.
  • What does pH describe in chemistry?
    pH describes the acidity or basicity of a solution.
  • What does the pH scale measure the concentration of?
    The pH scale measures the concentration of hydrogen ions (H+).
  • What is the pH of distilled water?
    The pH of distilled water is 7.
  • What is a neutral pH?
    A neutral pH is 7.
  • What pH values are considered acidic?
    pH values less than 7 are considered acidic.
  • What ion concentration does the pH scale measure?
    The pH scale measures the concentration of hydrogen ions (H+).
  • What is the formula for calculating pH from hydrogen ion concentration?
    pH = -log[H+]
  • What is the pH of distilled water under normal conditions?
    The pH of distilled water under normal conditions is 7.
  • What is the smallest pH possible under normal conditions?
    The smallest pH possible under normal conditions is 0.
  • In what pH range are hair, skin, and nails?
    Hair, skin, and nails are typically in the pH range of 4.5 to 5.5.