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pH Scale quiz #1

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  • What does the pH scale measure, and what do its values indicate about a solution's acidity or basicity?
    The pH scale measures the concentration of hydrogen ions in a solution. Values below 7 indicate acidity (high hydrogen ion concentration), values above 7 indicate basicity (low hydrogen ion concentration), and a value of 7 is neutral.
  • How do buffers help maintain pH homeostasis in living organisms, and why is this important?
    Buffers resist changes in pH by either accepting or donating hydrogen ions when acids or bases are added. This helps maintain pH around neutral (about 7), which is crucial because even slight pH changes can harm biological processes in living organisms.
  • Describe the relationship between pH and hydrogen ion concentration in a solution.
    pH is inversely proportional to hydrogen ion concentration: as pH decreases, hydrogen ion concentration increases (more acidic), and as pH increases, hydrogen ion concentration decreases (more basic).
  • What does the pH scale measure, and what do its values indicate about a solution's acidity or basicity?
    The pH scale measures the concentration of hydrogen ions in a solution. Values below 7 indicate acidity, values above 7 indicate basicity, and a value of 7 is neutral.
  • How do buffers help maintain pH homeostasis in living organisms, and why is this important?
    Buffers resist changes in pH by accepting or donating hydrogen ions when acids or bases are added. This is important because even slight pH changes can harm biological processes in living organisms.
  • Describe the relationship between pH and hydrogen ion concentration in a solution.
    pH is inversely proportional to hydrogen ion concentration: as pH decreases, hydrogen ion concentration increases (more acidic), and as pH increases, hydrogen ion concentration decreases (more basic).
  • What pH value is considered neutral, and what does this mean about the concentrations of hydrogen and hydroxide ions?
    A pH value of 7 is considered neutral. At this pH, the concentration of hydrogen ions equals the concentration of hydroxide ions.
  • What happens to the hydrogen ion concentration as the pH value increases?
    As the pH value increases, the hydrogen ion concentration decreases. This means the solution becomes more basic.
  • Why is it harmful for the pH of living organisms to change significantly from neutral?
    Significant changes in pH can disrupt biological processes and harm living organisms. Most organisms require a pH around 7 to survive.
  • How does the bicarbonate buffer system in blood help maintain pH balance?
    The bicarbonate buffer system can accept excess hydrogen ions when the concentration is too high or donate hydrogen ions when it is too low. This helps keep blood pH stable and close to neutral.