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Testing for the pH Factor in Liquids using the LabQuest (1st Version)

This is a short four-part video demonstrating how students in a science lab at the Texas School for the Blind and Visually Impaired use the LabQuest equipment from Vernier Science .  They are finding the pH factor of four liquids: distilled water, tap water, milk and vinegar. The data collection device used in the experiment is the stand-alone LabQuest-Version 1.  

LabQuest 1 is the only Vernier device that “accepts” the Sci-Voice scripting software.  With Sci-Voice installed, the LabQuest 1 device is able to voice the data.  This enables the student with a visual impairment to hear the incremental changes relative to time of any experiment that is recorded by a sensor probe used in conjunction with the LabQuest device.  Discerning the change in incremental findings of substances as they occur in real time is essential to laboratory experiments and data collection. 

 A pH sensor is plugged into one of the LabQuest’s analog inlets. The probe end is then inserted into a liquid until the reading is repeating itself for at least 5 times.  When this occurs, the reading is recorded as the pH factor of that particular liquid.

 Students record their findings in either braille using a Perkins braille writer or on a large print document.  After entering the data the probe is cleaned in distilled water and inserted in the next liquid.  All four liquids were recorded within the fifty-minute class period.  There were two groups of 4-5 students.  Each group had a Talking LabQuest, a pH sensor probe and four beakers containing different liquids.

Video of Experiment

Patrick Van Geem, TVI
AT Consultant


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