Analytical Chemistry: Tools of Trade

If a student needs to add 25 μl of NaOH to his sample, what is the most appropriate volume of micropipette he should use?

• 200 μl

• 1000 μl

• 10 μl

• 100 μl

Which of the following does not belong to the group?

• Eye wash station

• Fire Extinguisher

• Fume hood

• Emergency shower

Filtration is a process used to separate solids from liquids or gases using a filter medium that allows the fluid to pass through but not the solid.

Precipitates from gravimetric analyses are collected by filtration, washed, and then dried.

• Both statements are true

• Both statements are false

• First statement is true, second statement is false

• First statement is false, second statement is true

This is the process of measuring the actual quantity that corresponds to an indicated quantity on the scale of an instrument.

• Determination of concentration

• Amount Specification

• Measurement

• Calibration

Which of the following phenomenon might happen when a volumetric flask labeled TC (to contain) 20oC is subjected to 50oC?

• Explosion

• Thermal Expansion

• Composition weathering

• Glass contraction

The following must be worn when entering the laboratory EXCEPT:

• closed-toe shoes

• long pants

• safety goggles

• rubber watch

Which of the following responses below are sources of weighing error?

• 1. Weighing a sample that is warmer than ambient temperature.

• 2. Cooling a sample in a desiccator prior to weighing.

• 3. Periodically calibrating the balance

• 4. The temperature of the balance changing over time.

All the instruments below can measure 0.01 g. Which of them has the highest accuracy?

• analytical balance

• beam balance

• top loading balance

• platform balance

__________ is the upward force exerted on an object in a gaseous or liquid fluid. The mass measured by an analytical balance in air is _______________ its actual mass.

• buoyancy ; heavier than

• electromagnetic force ; lighter than

• tare ; equal to

• buoyancy ; lighter than

Which of the following is NOT a good practice when keeping a laboratory notebook?

• Record the names of computer files where programs and data are stored.

• Use complete sentences when writing notes.

• Write a balanced chemical equation for every reaction used.

• Use pencil in recording data for easy erasure when wrong