Education Technology

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  • Subject Area

    • Science: Chemistry: Atomic Structure and Periodic Table

  • Author

    Texas Instruments

  • Level

    9-12

  • Activity Time

    50 Minutes

  • Device
    • ax-icon-color-device
      TI-Nspire™ CX
    • ax-icon-color-device
      TI-Nspire™ CX CAS
    • TI-Nspire™ Navigator™
    • TI-Nspire™
    • TI-Nspire™ CAS
  • Software

    TI-Nspire™
    TI-Nspire™ CAS

  • TI-Nspire Version

    3.6

  • Accessories

    Sensor - Colorimeter
    TI-Nspire™ Lab Cradle

  • Other Materials
    • Two burettes
    • Double burrette clamp
    • Ring stand
    • Wash bottle & distilled water
    • One cuvette
    • Test tube rack & five (5) 20X150 mm test tubes
    • Stirring rod
    • KimWipes or tissues (preferably lint-free)
    • 5 mL of “NiSO4” unknown solution (for example-55 mL of “stock” solution and 45 mL of water-0.22 M)
    • 8-9 drops of green food coloring per liter of water to mimic 0.40 M NiSO4. (Nickel is a carcinogen, so the green food coloring is an excellent substitute.) Check the absorbance of this stock solution to be certain it falls in the range of 0.40 to 0.80.
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Beer's Law Data Collection Lab

Updated on 03/31/2014

Activity Overview

In this lesson, students will use a Colorimeter to discover the relationship between absorbance and concentration of a solution to ultimately determine an unknown solution.

Objectives

  • Students will make a serial dilution of a NiSO4 standard solution.
  • Students will use a Colorimeter to measure the absorbance value of each standard solution.
  • Students will find the relationship between absorbance and concentration of a solution.
  • Students will use the results of this experiment to determine the unknown concentration of another NiSO4 solution.

Vocabulary

  • Colorimeter
  • transmittance
  • absorbance
  • slope
  • y-intercept
  • correlation coefficient

About the Lesson

This lesson involves absorbance data for solutions of various concentration.
As a result, students will:

  • Become familiar with TI-NspireTM technology and the Vernier DataQuestTM application.
  • Use this graph to make conclusions about the experiment.
  • Use a Colorimeter to make measurements.
  • Analyze a graph of the data.

 

You may want to have students create a Lab Report using TI-Nspire following this lab activity. A sample lab report is provided in the downloads.