In this Issue

- Acid Rain Experiment
- ISE-100 pH Electrode
  Tech Note
- Web Resources
- New Products from iWorx
- Clearance Items

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The iWorx newsletter is a FREE monthly publication dedicated to sharing teaching laboratory techniques and other useful information with educators in the fields of Anatomy and Physiology. We will also be sending you technical information and info on new developments at iWorx that we feel may be of use to you in your teaching and research activities.

About iWorx
iWorx has everything you need to add excitement and distance learning to any physiology teaching program. Our products include data acquisition hardware, professionally -developed physiology courseware, innovative web tools, and a full selection of transducers, cables, front ends and accessories.

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©2007 CB Sciences, Inc.  iWorx is a trademark of CB Sciences, Inc.

February 2007

 Experiment:  Acid Rain

Acid rain is a worldwide environmental problem that occurs when sulfur dioxide (SO₂) and nitric oxide (NO) from industrial emissions enter the atmosphere. These chemicals are transformed into acids when mixed with air and water. When these pollutants fall to earth in any form of precipitation or dust, the acidity of soil and water in the environment is increased to the point that fish and invertebrates can no longer live in some lakes anymore; essential minerals that are needed for plant growth are removed from the soil, causing damage to crops and destruction of forests; and, toxic ions released from the soil contaminate the water supply.

The slight acidity of normal rainwater, which is about pH 5.6, comes from the naturally occurring concentrations of nitric oxide, sulfur dioxide, and carbon dioxide (CO₂) in the lowest layer of the atmosphere. When the concentrations of nitric oxide and sulfur dioxide are altered by the addition of large quantities of these compounds from industrial activities, like the production of electricity using fossil fuels, the rainwater becomes more acidic.

In this experiment, students will generate the gases that create acid rain: carbon dioxide, nitrogen dioxide, and sulfur dioxide. The gases will then be bubbled through water as the acidity of the water is monitored using a pH electrode attached to an iWorx 214 data acquisition unit.

Download Acid Rain experiment.

Download screen optimized or press optimized Acid Rain experiment.

ISE-100 pH Electrode

The ISE-100 is an easy-to-use pH electrode that is capable of measuring the acidity of solutions over a pH range of 0 to 12.  The ISE-100 is a combination electrode with both the recording and reference electrodes included in the same housing.  The plastic housing at the end of the electrode protects the glass membrane and reduces the probability of the electrode breaking as it is handled. 

View a Tech Note here.

ISE-100 pH Electrode

ISE-100

pH Electrode

$155

$125

Download the updated settings group for this month's experiment and the other experiments published in the iWorx Newsletter.

Whether you plan to download any of the experiments announced in recent editions of the iWorx Newsletter or a new copy of the LabScribe Installation CD, you need a password and an ID to access the download sites for these items. 

To register for a new ID and password, please go here.   After you receive confirmation that user account has been activated, return to the same site and click on the Enter link. 

Registered users can log-in here.

To download screen or press optimized copies of the latest lab experiments and Tech Notes published in the iWorx Newsletters, go here and select the lab experiment of interest.

If you plan to use any of the experiments or manuals announced in recent editions of the iWorx Newsletter, you should obtain a copy of the settings group used to configure LabScribe for these experiments.  To download the settings file, right click here and choose "Save Target As" in the Internet Explorer browser or "Save Link As" in the Firefox browser.  Save the file in your LabScribe Folder.  When you launch LabScribe, the settings group will be available from Load Group command in the Settings menu.

The write-ups and the settings files for the blood pressure experiments in the iWorx Physiology Manual have been updated.  The latest version of the LabScribe Installer CD that contains the updates, is available for free on the iWorx Users Area.

Learn more about Acid Rain by going to the external Web resources page.

On this page we have also accumulated a host of links to informative, external physiology Web sites and conveniently categorized them into major subcategories for easy reference.

iWorx is dedicated to the ongoing development of new products to provide you with more lab options for your physiology teaching curricula.  Click on the links below to see the most recent product introductions:

Clearance Items

iWorx has a large supply of new and trade-in items at up to 70% discount.  Also check with us about trade in allowances for your older Powerlab or Biopac equipment.  Customers in the U.S. and Canada can order directly online. See specials