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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

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