Practice IR Spectroscopy Quantitation - 4.3 | Unit 11: Measurement and Data Processing | IB Grade 11: Chemistry
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Knowledge

4.3 - IR Spectroscopy Quantitation

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is Beer’s law?

💡 Hint: Think about how absorbance relates to concentration.

Question 2

Easy

What does the path length (L) refer to?

💡 Hint: Consider what happens to light as it passes through the solution.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does Beer’s law relate to?

  • Volume of the sample
  • Absorbance and concentration
  • Chemical structure

💡 Hint: Consider what aspect of light measurement is being defined.

Question 2

True or False: A calibration curve can be used to find unknown concentrations.

  • True
  • False

💡 Hint: Think about why we create a graph.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

You are given a series of absorbance data for a solution: 0.12, 0.25, 0.45, 0.60. If these correspond to concentrations of 0.5, 1.0, 1.5, and 2.0 M, determine the slope of the calibration curve and predict the concentration for an unknown sample with an absorbance of 0.38.

💡 Hint: Identify how changes in absorbance relate to changes in concentration.

Question 2

An unknown solution gives an absorbance of 0.87 and has associated uncertainties of ±0.02. If the calibration curve slope is 0.45 with an uncertainty of ±0.01, calculate the concentration of the unknown and the propagated uncertainty.

💡 Hint: Follow the steps for uncertainty propagation diligently.

Challenge and get performance evaluation