Laboratory Techniques and Procedures

Jeremy Krug provides a ten-minute review of AP Chemistry laboratory skills, covering lab safety, equipment usage, classic experiments, separation techniques, spectrophotometry, and error analysis. The video emphasizes the importance of understanding these concepts for the AP exam and encourages viewers to engage with the content and continue learning.

What is the correct procedure if you spill an acid in the lab?

• Use a strong base to neutralize it

• Neutralize it with a weak base like baking soda

• Ignore it and continue working

• Add water to dilute it

Which lab equipment would you use to measure a precise volume of liquid?

• Beaker

• Graduated cylinder

• Volumetric pipette

• Florence flask

What is the primary use of an Erlenmeyer flask?

• To store solutions

• To distill liquids

• To swirl and mix solutions without spilling

• To measure precise volumes

In an acid-base titration, what indicates that you have reached the endpoint?

• The solution forms a precipitate

• The solution starts boiling

• The solution changes color

• The solution becomes clear

Which separation technique is best for separating a solid from a liquid?

• Distillation

• Chromatography

• Filtration

• Spectrophotometry

What is the main purpose of spectrophotometry in a lab setting?

• To measure the pH of a solution

• To measure the boiling point of a liquid

• To determine the concentration of a solution

• To separate components of a mixture

How does contamination with water affect the concentration in spectrophotometry?

• It has no effect

• It increases the concentration

• It decreases the concentration

• It doubles the concentration

What is the formula for calculating percent error?

• Absolute value of the difference between calculated and correct answer, divided by the correct answer, multiplied by 100

• Difference between calculated and correct answer, divided by the calculated answer, multiplied by 100

• Sum of calculated and correct answer, divided by the correct answer, multiplied by 100

• Absolute value of the difference between calculated and correct answer, divided by the calculated answer, multiplied by 100

What is the role of a calibration curve in spectrophotometry?

• To estimate the concentration of an unknown solution

• To separate components of a mixture

• To determine the pH of a solution

• To measure the boiling point of a solution

What is the effect of a faulty thermometer reading too high in an ideal gas law experiment?

• The calculated number of moles will be too high

• The calculated number of moles will be too low

• The pressure will be too high

• The volume will be too low