Electrolytes and Absorbance Measurements

The video tutorial covers the basics of solutions and electrolytes, including strong and weak electrolytes. It features an instructor demonstration using a lamp to show how different solutions conduct electricity. Students then test various household products for electrolytes. The tutorial concludes with a lab exercise on measuring solution concentration and absorbance using a photometer.

What is the primary difference between a solute and a solvent?

• Both are gases.

• A solvent is dissolved in a solute.

• A solute is dissolved in a solvent.

• A solute is a liquid, and a solvent is a solid.

Why does sodium chloride solution light up the lamp in the experiment?

• It is a strong electrolyte with complete ionization.

• It is a non-electrolyte.

• It contains free electrons.

• It is a weak electrolyte.

Which of the following is a strong electrolyte?

• Acetic acid

• Water

• Hydrochloric acid

• Fruit punch

Which household product showed the presence of electrolytes by lighting the lamp faintly?

• Pedialyte

• Ammonia cleaner

• Fruit punch

• Club soda

What does a dim light indicate about the electrolyte concentration in a solution?

• No ions present

• Low concentration of ions

• Presence of non-electrolytes

• High concentration of ions

What is the purpose of using a volumetric flask in the solution preparation?

• To heat the solution evenly.

• To measure the exact volume of the solution.

• To filter the solution.

• To cool the solution quickly.

Why is it important to control the water level in a volumetric flask?

• To prevent the solution from boiling.

• To keep the solution cold.

• To ensure the correct concentration of the solution.

• To avoid contamination.

What is the role of a 'blank' in absorbance measurements?

• To calibrate the instrument to zero absorbance.

• To increase the absorbance reading.

• To decrease the absorbance reading.

• To measure the temperature of the solution.

What does the absorbance measurement tell us about a solution?

• The color of the solution

• The temperature of the solution

• The concentration of the solution

• The pH of the solution

Which solution was used as a blank in the absorbance measurement?

• Acetic acid

• Water

• Hydrochloric acid

• Sodium chloride solution