Untitled Quiz
40 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

To prepare 200 ml of a 0.20 M NaOH solution, how many moles of NaOH are required?

  • 0.10 mol
  • 0.20 mol
  • 0.02 mol
  • 0.04 mol (correct)

    • What is the formula to calculate the mass of a substance from the number of moles and relative formula mass?

  • Molarity = Mass / Volume
  • Mass = Moles × Molar mass (correct)
  • Mass = Volume × Moles
  • Moles = Mass / Molar mass

    • What is the relative formula mass (RFM) of NaOH, considering Na=23 g/mol, O=16 g/mol, and H=1 g/mol?

  • 32 g/mol
  • 40 g/mol (correct)
  • 34 g/mol
  • 38 g/mol

    • Which of the following represents the molarity calculation correctly?

    <p>M = moles / liters of solution</p> Signup and view all the answers

    What degree of precision can an analytical balance achieve?

    <p>0.0001 g</p> Signup and view all the answers

    What is the first step in preparing to use an analytical balance?

    <p>Preheat the balance</p> Signup and view all the answers

    When calculating molality, what is the numerator in the formula?

    <p>moles of solute</p> Signup and view all the answers

    Which step is important for maintaining the accuracy of an analytical balance?

    <p>Calibration and cleaning</p> Signup and view all the answers

    What is the correct purpose of the triple beam balance?

    <p>To measure mass very precisely</p> Signup and view all the answers

    What is the reading error of the triple beam balance?

    <p>+/- 0.05 gram</p> Signup and view all the answers

    Which of the following best describes the components of a pH meter's measuring electrode?

    <p>Silver/silver chloride generates stable voltage based on pH</p> Signup and view all the answers

    Which beam of the triple beam balance is considered the smallest?

    <p>Front beam</p> Signup and view all the answers

    What does the term pH represent?

    <p>The potential of hydrogen ions in a solution</p> Signup and view all the answers

    How should the riders on the triple beam balance be positioned before measuring?

    <p>At the leftmost position</p> Signup and view all the answers

    What does the glass membrane in a pH measuring electrode do?

    <p>Allows H+ ions to pass</p> Signup and view all the answers

    Which statement is true regarding the size of the beams on the triple beam balance?

    <p>The middle beam measures 100-500g</p> Signup and view all the answers

    What should you do to ensure the balance pointer indicates zero before weighing an object?

    <p>Move the riders to the leftmost position and adjust the zero knob</p> Signup and view all the answers

    Why should nothing be placed on the pans when the balance is not in use?

    <p>To avoid inaccurate measurements during calibration</p> Signup and view all the answers

    Which beam on a triple beam balance is used for measuring the largest mass?

    <p>Middle beam (100-500g)</p> Signup and view all the answers

    What is the reading error range for the triple beam balance?

    <p>+/- 0.05 gram</p> Signup and view all the answers

    When estimating the weight of an object, what must be done after placing the object on the left pan?

    <p>Move the main and supplementary riders until the pointer is at zero</p> Signup and view all the answers

    What is the purpose of the zero adjustment knob on a double beam balance?

    <p>To fine-tune the pointer back to the zero mark</p> Signup and view all the answers

    What is the smallest measurement range available on a triple beam balance?

    <p>0-10g</p> Signup and view all the answers

    What is the first step in using a double beam balance?

    <p>Set the main and supplementary riders to the left end</p> Signup and view all the answers

    What is the effect of a two-fold dilution on the concentration of a solution?

    <p>It reduces the concentration by one half.</p> Signup and view all the answers

    What is the formula used for preparing a dilute solution from a concentrated solution?

    <p>M1 X V1 = M2 X V2</p> Signup and view all the answers

    To prepare 100 ml of 0.1 M HCl from a 1.0 M HCl solution, what volume of the concentrated solution is required?

    <p>10 ml</p> Signup and view all the answers

    How is a percent solution typically expressed in a laboratory setting?

    <p>Grams of solute per 100 ml of solution.</p> Signup and view all the answers

    Which of the following represents a weight to volume (w/v) percent solution?

    <p>10 g of solute in 200 ml of solution.</p> Signup and view all the answers

    In the calculation for preparing a dilute solution from a concentrated one, what does V1 represent?

    <p>Initial volume of the concentrated solution.</p> Signup and view all the answers

    What does a volume to volume (v/v) percent solution imply?

    <p>Milliliters of solute per 100 ml of solution.</p> Signup and view all the answers

    What happens to the concentration when diluting a solution?

    <p>The concentration decreases.</p> Signup and view all the answers

    What role does the reference electrode play in a pH meter?

    <p>It provides a constant reference potential for accurate comparison.</p> Signup and view all the answers

    At what pH value is a solution considered neutral?

    <p>pH = 7</p> Signup and view all the answers

    What is the potential consequence of using a pH < 4.3 in corrosion prevention?

    <p>It could prevent corrosion effectively.</p> Signup and view all the answers

    Which of the following steps is essential before measuring pH with a pH meter?

    <p>Rinse the electrode with distilled water.</p> Signup and view all the answers

    In agriculture, why is it important to monitor pH levels?

    <p>To avoid toxic conditions if pH is too low.</p> Signup and view all the answers

    What should be the pH range for the brewing process?

    <p>pH 3.9-4.0</p> Signup and view all the answers

    When calibrating a pH meter, which buffer solutions are typically used?

    <p>pH 4, pH 7, and pH 10</p> Signup and view all the answers

    What can result from incorrect pH levels in pharmaceutical production?

    <p>Toxicity from mold-produced substances.</p> Signup and view all the answers

    More Like This

    Untitled Quiz
    6 questions

    Untitled Quiz

    AdoredHealing avatar
    AdoredHealing
    Untitled Quiz
    55 questions

    Untitled Quiz

    StatuesquePrimrose avatar
    StatuesquePrimrose
    Untitled Quiz
    18 questions

    Untitled Quiz

    RighteousIguana avatar
    RighteousIguana
    Untitled Quiz
    50 questions

    Untitled Quiz

    JoyousSulfur avatar
    JoyousSulfur
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser