What Is The pH Scale Quiz

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| By Sayan_mitra92
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Sayan_mitra92
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Quizzes Created: 15 | Total Attempts: 4,402
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What Is The pH Scale Quiz - Quiz

How well do you know about the ph scale? It is time to test your knowledge by taking this quiz.


Questions and Answers
  • 1. 

    The neutral value on the pH scale is

    • A.

      Less than 7

    • B.

      Equal to 7

    • C.

      Greater than 7

    • D.

      Not sure

    Correct Answer
    B. Equal to 7
    Explanation
    The neutral value on the pH scale is equal to 7. This means that a substance with a pH of 7 is neither acidic nor basic. It is considered to be neutral. The pH scale ranges from 0 to 14, with values less than 7 indicating acidity and values greater than 7 indicating alkalinity. A pH of 7 represents a balance between acidity and alkalinity, making it neutral.

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  • 2. 

    Water dissociates into H+ and OH- ions

    • A.

      To a large degree

    • B.

      To a small degree

    • C.

      Not at all

    • D.

      Not sure

    Correct Answer
    B. To a small degree
    Explanation
    Water dissociates into H+ and OH- ions to a small degree. This is because water molecules can ionize into H+ and OH- ions through a process called self-ionization or autoprotolysis. However, this process is very limited, with only a small fraction of water molecules dissociating into ions at any given time. The majority of water molecules remain intact, making water a very weak electrolyte.

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  • 3. 

    The pH scale is

    • A.

      A logarithmic scale

    • B.

      A linear scale

    • C.

      An exponential scale

    • D.

      Not sure

    Correct Answer
    A. A logarithmic scale
    Explanation
    The pH scale is a logarithmic scale because it measures the concentration of hydrogen ions in a solution. Each unit on the pH scale represents a tenfold difference in acidity or alkalinity. This means that a solution with a pH of 3 is ten times more acidic than a solution with a pH of 4, and a hundred times more acidic than a solution with a pH of 5. Therefore, the pH scale is not linear or exponential, but logarithmic in nature.

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  • 4. 

    What is the H+ of a solution if the pH is 3.5?

    • A.

      3.16 x 10 to the power 4

    • B.

      3.16 x 10 to the power -4

    • C.

      3.5 x 10 to the power 4

    • D.

      3.5 x 10 to the power -4

    Correct Answer
    B. 3.16 x 10 to the power -4
    Explanation
    The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution. A pH of 3.5 indicates that the solution is acidic. The concentration of H+ ions in an acidic solution is higher than in a neutral or alkaline solution. The answer 3.16 x 10 to the power -4 represents the concentration of H+ ions in the solution, with a negative exponent indicating a small value. Therefore, the correct answer is 3.16 x 10 to the power -4.

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  • 5. 

    A solution has a [H+] = 7.0 x 10 to the power -11. What is its pH?

    • A.

      10.15

    • B.

      -10.15

    • C.

      11

    • D.

      -11

    Correct Answer
    A. 10.15
    Explanation
    The given solution has a hydrogen ion concentration of 7.0 x 10^-11, which is a very low concentration. pH is a measure of the acidity or alkalinity of a solution and is defined as the negative logarithm (base 10) of the hydrogen ion concentration. By taking the negative logarithm of 7.0 x 10^-11, we get 10.15, which is the pH of the solution.

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  • 6. 

    Bases have a pH

    • A.

      Not sure

    • B.

      Less than 7

    • C.

      Equal to 7

    • D.

      Greater than 7

    Correct Answer
    D. Greater than 7
    Explanation
    Bases have a pH greater than 7 because they release hydroxide ions (OH-) when dissolved in water. These hydroxide ions react with hydrogen ions (H+) in a solution, reducing their concentration and increasing the concentration of hydroxide ions. This shift in the balance of ions results in a higher pH value, indicating alkalinity. Therefore, bases typically have a pH greater than 7.

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  • 7. 

    An acidic solution has

    • A.

      A greater concentration of hydroxide ions than hydrogen ions

    • B.

      Equal concentration of hydrogen ions than hydroxide ions

    • C.

      Not sure

    • D.

      A greater concentration of hydrogen ions than hydroxide ions

    Correct Answer
    D. A greater concentration of hydrogen ions than hydroxide ions
    Explanation
    An acidic solution has a greater concentration of hydrogen ions than hydroxide ions. This is because an acid is a substance that donates hydrogen ions (H+) in a solution. Hydroxide ions (OH-) are found in basic solutions, where there is a greater concentration of OH- ions than H+ ions. Therefore, the correct answer is that an acidic solution has a greater concentration of hydrogen ions than hydroxide ions.

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  • 8. 

    The pH scale ranges from

    • A.

      0 to 12

    • B.

      0 to 10

    • C.

      0 to 14

    • D.

      Not sure

    Correct Answer
    C. 0 to 14
    Explanation
    The pH scale is a measure of the acidity or alkalinity of a solution. It ranges from 0 to 14, where 0 represents highly acidic solutions, 7 represents neutral solutions, and 14 represents highly alkaline solutions. This scale is logarithmic, meaning that each whole number increase or decrease on the scale represents a tenfold change in acidity or alkalinity.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 21, 2015
    Quiz Created by
    Sayan_mitra92
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