Practice Selecting Wavelength and Preparing Calibration Curve - 3.2.2 | Unit 11: Measurement and Data Processing | IB Grade 11: Chemistry
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Knowledge

3.2.2 - Selecting Wavelength and Preparing Calibration Curve

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

Define λ_max.

💡 Hint: Think about what wavelength would give the strongest signal for a compound.

Question 2

Easy

What is the purpose of a calibration curve?

💡 Hint: This curve connects measured values to concentrations.

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 λ_max indicate?

  • The wavelength with the lowest absorbance
  • The wavelength with the highest absorbance
  • The slope of the calibration curve

💡 Hint: Think about which point on a graph would give you the highest value.

Question 2

True or False: The calibration curve represents a direct linear relationship between absorbance and concentration.

  • True
  • False

💡 Hint: Consider the graphical representation of the data.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

A standard calibration curve for a color solution has points (1 mg/L, 0.1 A) and (5 mg/L, 0.5 A). Calculate the slope and intercept of the best-fit line. Show your work.

💡 Hint: Draw the graph to visualize the relationships, and apply the slope-intercept formula.

Question 2

An unknown sample shows an absorbance of 0.45 A at λ_max. If your calibration curve shows the equation A = 0.1C (where A is absorbance and C is concentration in mg/L), calculate the concentration of the unknown sample and propagate uncertainties.

💡 Hint: Look at both the slope and the absorbance value for calculations.

Challenge and get performance evaluation