Practice NMR Quantitative Analysis - 4.4 | Unit 11: Measurement and Data Processing | IB Grade 11: Chemistry
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4.4 - NMR Quantitative Analysis

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What is the primary function of an internal standard in NMR?

💡 Hint: Think about how we compare two substances in NMR.

Question 2

Easy

Define the term 'integral' in the context of NMR spectroscopy.

💡 Hint: What does the area represent in terms of molecules?

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 the integral in an NMR spectrum represent?

  • The concentration of the sample
  • The number of protons
  • The molecular weight

💡 Hint: Think about what the area under a peak means.

Question 2

True or False: An internal standard must be present in a higher concentration than the analyte.

  • True
  • False

💡 Hint: Consider the comparison between the standard and analyte.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

You analyze a mixture containing benzene and toluene using an internal standard of 15 mg of ethylbenzene. If the integral for toluene is measured at 10.00 and that of the internal standard is at 5.00, calculate the expected moles of toluene present if the molar mass of toluene is 92.14 g/mol.

💡 Hint: Make sure to calculate the proportion of moles correctly.

Question 2

You conduct an NMR analysis and receive a signal at 9.00 (integral) with an uncertainty of ±0.01. How does this uncertainty affect the overall concentration determination if the integrals for other measurement are consistent?

💡 Hint: Analyze the cumulative effect of the uncertainties involved.

Challenge and get performance evaluation