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pH and pOH quiz #1

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Terms in this set (40)

  • What happens to the pH of a solution when hydrogen ions (H+) are added?
    The pH decreases, making the solution more acidic.
  • What happens to the pH of a solution when H+ ions are added to it?
    The pH decreases, indicating increased acidity.
  • What is the best description of a solution with a pH of 6?
    It is a weakly acidic solution.
  • Which describes an alkaline solution: pH less than 7, pH equal to 7, basic, acidic?
    An alkaline solution is basic and has a pH greater than 7.
  • What does a high pOH value indicate about the acidity or basicity of a substance?
    High pOH indicates high acidity (low basicity).
  • What is the pH of an aqueous solution with the hydronium ion concentration [H3O+] = 2 x 10^-14 M?
    pH = -log(2 x 10^-14) ≈ 13.7
  • How can the pH of a solution be calculated if the pOH is known?
    pH = 14 - pOH (at 25°C).
  • Which value is a measure of the hydrogen ion concentration of a solution?
    pH measures the hydrogen ion concentration.
  • How does decreasing the pH decrease carbonate (CO3^2-) concentration?
    Lower pH increases H+ concentration, which reacts with CO3^2- to form HCO3^-, reducing CO3^2- concentration.
  • Which 1.0 M solution has the highest pH: HCl, NaOH, CH3COOH, or NH4Cl?
    1.0 M NaOH would have the highest pH.
  • What is the pH level of a typical shampoo designed for regular use?
    Typical shampoo has a pH around 5-7.
  • A pH of 6 is how many times more acidic than a pH of 9?
    A pH of 6 is 1,000 times more acidic than a pH of 9.
  • What is the pH of a solution with a pOH of 6.0 at 25°C, and what does it indicate about the solution's acidity or basicity?
    The solution is basic (pH = 8.0 at 25°C).
  • Which of these substances has the lowest pH: lemon juice, milk, ammonia, water?
    Lemon juice has the lowest pH.
  • Is using a pH meter qualitative or quantitative?
    Using a pH meter is quantitative.
  • What is the pH of ammonia?
    Ammonia solution typically has a pH around 11.
  • The pOH of a solution is 10.75. What is the concentration of OH– ions in the solution?
    [OH–] = 10^-10.75 ≈ 1.78 x 10^-11 M
  • Which is the measure of concentration of H+ in a solution?
    pH measures the concentration of H+ ions.
  • Which of these refers to the concentration of an acid?
    The concentration of H+ ions or hydronium ions.
  • Which pH value corresponds to the highest hydrogen ion concentration among pH 2, pH 5, pH 7, and pH 10?
    The solution with pH 2 has the highest H+ concentration.
  • The pH of a basic solution is 9.77. What is [OH–]?
    [OH–] = 10^-(14 - 9.77) = 10^-4.23 ≈ 5.9 x 10^-5 M
  • If the pH of a solution is 4, what does this indicate about the solution?
    The solution is acidic.
  • What is the approximate pH at the equivalence point of curve (a) in a strong acid-strong base titration?
    The pH at the equivalence point is approximately 7.
  • A pH of 5 is how many more times acidic than a pH of 6?
    A pH of 5 is 10 times more acidic than a pH of 6.
  • What is the color of bromcresol green indicator in a solution with a pH of 2.0?
    Bromcresol green is yellow at pH 2.0.
  • If the pOH increases, is a solution getting more basic or less basic?
    As pOH increases, the solution becomes less basic (more acidic).
  • How many moles of H+ would this same solution have per liter if [H+] = 1 x 10^-4 M?
    1 x 10^-4 moles per liter.
  • What is the pH of a 10^-4 M HCl solution?
    pH = -log(1 x 10^-4) = 4
  • Among 1.0 M solutions of HCl, NaOH, CH3COOH, and NH4Cl, which has the highest pH?
    1.0 M NaOH would have the highest pH.
  • What is the pH at the equivalence point in a strong acid-strong base titration?
    The pH is approximately 7.
  • Compare the paper to the pH color chart. What is the pH of ammonia?
    Ammonia typically has a pH around 11.
  • What information about a chemical solution can be inferred from knowing its pH value?
    You can determine if the solution is acidic, basic, or neutral and estimate the H+ concentration.
  • Bleach has a pH of around 12. What is it considered on the pH scale?
    Bleach is considered strongly basic.
  • What is the pH of a solution with a hydrogen ion concentration of 1.3 x 10^-11 M?
    pH = -log(1.3 x 10^-11) ≈ 10.89
  • If the pH of a 0.15 M acid is 3.6, what does this indicate about the acid?
    It is a weak acid, since strong acids at this concentration would have a lower pH.
  • What is the pH of the solution after 50.0 mL of base has been added in a titration?
    The pH depends on the equivalence point and the strength of acid/base; typically, it is near neutral if equivalence is reached.
  • If the pH of a solution decreases, what happens to its acidity?
    The solution becomes more acidic.
  • Which solution has the highest pH: 0.1 M HCl, 0.1 M NaOH, 0.1 M CH3COOH, 0.1 M NH4Cl?
    0.1 M NaOH has the highest pH.
  • A solution has a [OH–] = 3.4 x 10^-5 M at 25°C. What is the [H3O+] of the solution?
    [H3O+] = Kw / [OH–] = 1.0 x 10^-14 / 3.4 x 10^-5 ≈ 2.94 x 10^-10 M
  • What is the value of using pH paper as an indicator?
    It provides a quick, qualitative estimate of pH.