Polarimeter (Chemical)

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The Chemical Polarimeter is a device used for measuring the rotation of plane-polarized light caused by optically active substances such as organic, inorganic, or biological compounds.

Description

The Polarimeter can be used to measure chiral properties of optically active samples without chemically modifying or destroying the sample. This is a vertical polarimeter that uses a 589 nm LED, a fixed polarizer, and a manually rotated polarizer to detect changes in rotation of plane-polarized light in the presence of an optically active compound. Used with Vernier technology, students no longer have to determine the optical maximum with their eye but have a graph that shows a clear change in the light’s polarization.

Videos

Specifications

  • Encoder Resolution: 0.25°
  • Accuracy (optical rotation measurements): ±1°
  • Sensitivity: typically up to OD 2
  • Optical Encoder: Bidirectional, quadrature encoder, 360 cycle per revolution
  • Light Source: LED
  • Wavelength (nominal): 589 nm

Download the user manual for full specifications

Experiments and Lab Ideas

Experiments

Preview and/or edit the polarimetry experiments for your curriculum by downloading the experiments below. The Student download includes objectives, materials, procedures, and analysis. The Instructor download includes notes, sample results and graphs, and answers.

Experiment Download
1 Understanding Polarimetry Student Instructor
2 Observing the Reaction Kinetics of Sucrose with Polarimetry Student Instructor
3 Isolation and Characterization of Protein and Sugar from Milk Student Instructor
4 Isolating the Enantiomers of 1-Phenylethylamine by Fractional Crystalization Student Instructor

Lab Ideas

  • Determine sugar solution purity by optical rotation.
  • Characterize the purity of organic and inorganic syntheses yielding chiral products.
  • Determine the enantiometric purity of optically active compounds.
  • Resolve racemic mixtures.
  • Study the kinetics of acid-catalyzed hydrolysis.
  • Study the kinetics of enzyme-catalyzed hydrolysis.
  • Explore the optical activity of amino acids.

What’s Included

  • Vernier Chemical Polarimeter
  • One Chemical Polarimeter Sample Cell
  • User manual

Sensor Requirements

The Polarimeter (Chemical) requires a compatible interface and software to collect data. Interface and software sold separately. Getting started with probeware »

Compatible Interfaces

The Polarimeter (Chemical) is compatible with these interfaces:

Software Requirements

The Polarimeter (Chemical) requires data-collection software:

Ordering Information

All prices are for U.S. educators.

    NameOrder CodePriceQuantity
    Polarimeter (Chemical)CHEM-POL$499
    Optional Accessories
    Chemical Polarimeter CellsCELLS-POL$66

    Related Products

    Educational use only: Vernier products are designed for educational use. They are not appropriate for industrial, medical, or commercial applications. Product usage disclaimer »

    Order Code CHEM-POL
    U.S. Educator Price $499

    Sample Data

    Optical rotation of sucrose
    Optical rotation of sucrose
    Polarimetry runs for the inversion reaction of sucrose as catalyzed by HCl
    Polarimetry runs for the inversion reaction of sucrose as catalyzed by HCl
    Kinetic trace and single exponential fit for the inversion reaction of sucrose as catalyzed by HCl
    Kinetic trace and single exponential fit for the inversion reaction of sucrose as catalyzed by HCl
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