Vernier Software and Technology
Vernier Software & Technology

College Chemistry Blog

Periodic Elements

Decoding Your Absorbance Readings

Published July 24, 2018 by Melissa

In an effort to help you and your students better understand spectrometer absorbance readings, we are answering a few commonly asked questions about absorbance units, obtaining accurate readings, and the importance of using quartz cuvettes.

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Calibrating a Drop Counter

Published July 3, 2018 by Nusret

The realities behind calibrating a Vernier Drop Counter—tips on how to save time between uses. Bonus—get a free centering widget for your Drop Counter.

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Why You Want an ORP Sensor

Published June 18, 2018 by Elaine

In education, a common application for an ORP sensor is a potentiometric titration. Similar to an acid-base titration, a titrant is added to a sample incrementally until all the sample has reacted and the end-point is reached. Students can apply their understanding of redox is by using a Vernier Go Direct ORP Sensor to determine the concentration of H2O2 by titrating the solution with KMnO4.

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Three Tips For Keeping Your pH Sensor Healthy

Published May 4, 2018 by Elaine

Keep your pH sensor hydrated, clean your pH sensor, and maintain your pH calibration solutions to ensure your pH sensors always give you great data. Plus, a bonus tip to save money on buffer solutions.

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Go Direct® pH Sensor

Do I Need to Calibrate My pH Sensor?

Published April 30, 2018 by Elaine

A calibration equation is stored on each pH Sensor before it is shipped. For the most accurate measurements with this sensor, we recommend you perform your own 2-point calibration with buffer solutions.

As the pH Sensor ages, the performance of the electrode will change and drift from the saved calibration. Good maintenance and recalibration of the pH Sensor will ensure the readings are accurate.

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The Theory Behind pH Measurements

Published April 6, 2018 by Elaine

pH is a quantitative unit of measure that describes the degree of acidity or alkalinity of a substance. It is measured on a scale of 0 to 14. The formal definition of pH is the negative logarithm of the hydrogen ion concentration (i.e., pH = –log10[H+]). In practice, it is the hydrogen ion activity that is measured, rather than its concentration. The activity is a measure of the "effective concentration".

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