Order Laboratory Procedure Discussion

Order Laboratory Procedure Discussion
Order Laboratory Procedure Discussion
Which of the following is an acceptable laboratory practice?
(A) Placing hot objects on a balance
(B) Diluting a solution in a volumetric flask with hot water
(C) Using 5 mL of phenolphthalein to titrate 20 mL of an acidic
solution
(D) Adding water slowly to a preweighed solid acid in a dry
Erlenmeyer flask
(E) Rinsing a burette with a standardized solution before filling
it with the standardized solution
430. The proper procedure for the dilution of concentrated NaOH is
to slowly add the base to a beaker of water rather than slowly
adding water to the beaker of base. This precaution is to
ensure that
Order Laboratory Procedure Discussion
(A) there is sufficient time for the full ionization of NaOH.
(B) the water does not float on top of the denser base and
remain unmixed.
(C) the base does not react with the dry beaker or impurities in
the beaker.
(D) there is a enough water to absorb the heat released.
(E) there is enough water for the OH−
ions to be completely
dissolved.
431. A student accidentally splashes a concentrated, strong acid
onto his bare skin. Which of the following is the safest and
most effective course of action?
(A) Dry the skin with paper towels.
(B) Flush the area with water and a dilute solution of a weak
acid.
(C) Flush the area with a dilute NaOH solution, then water.
(D) Flush the area with water and then a dilute solution of
NaHCO3
.
(E) Sprinkle the area with powdered Na2SO4
, then carefully
shake off the excess and rinse with water.
432. A student dissolves a 20.0 mol sample of acetic acid, a weak
acid, into 1 kg of water to make a 20.0 molal solution.
Order Laboratory Procedure Discussion
Assuming no other information is available to the student,
which of the following is the best way to determine the molarity
of the solution?
(A) Titrate with a standard acid
(B) Measure the total volume of the solution
(C) Determine the freezing point of the solution
(D) Measure the pH with a calibrated pH meter
(E) Measure the electrical conductivity of the solution
433. A 98-gram sample of phosphoric acid, H3PO4
(a weak acid), is
dissolved in 1 kg of water. Assuming no other information is
available, which of the following procedures is the best way to
determine the molarity of the solution?
(A) Measure the total mass of the solution
(B) Measure the total volume of the solution
(C) Measure the pH of the solution with a calibrated pH meter
(D) Determine the boiling point of the solution
(E) Titrate the solution with a standard acid
Questions 434–438 refer to the following answer choices:
(A) Visible-light spectrophotometry (colorimetry)
(B) Paper chromatography
(C) Titration
(D) Gravimetric determination or differential precipitation
(E) Electrodes
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