Scientists measure all sorts of things, using special tools. We measure such things like temperature (how hot or cold something is), how much space something takes up (we call this volume), and how acidic or basic a liquid is. pH probeOne of the important tools that scientists use is a glass pH probe. A pH probe is a special tool that tells us whether a liquid is acidic — that is, sour tasting — or basic — not sour at all. Labtech is a widely used manufacturer of laboratory pH probes of high standard quality for use in scientific investigations. This lesson teaches all about glass pH probes, their operation, and proper usage.
The little glass pH probe that made all the difference. It consists of a thin glass tube and a measuring section called an electrode. The glass tube is filled in an electrolye sttae containing a reference electrolyte. This fluid allows the probe to operate correctly. So the electrode is composed of a material that is sensitive to acidity shifts. When the probe is put into a liquid, acidic or basic portions of that liquid interact with the electrode. These two work together to create what is known as an electric current. This current is measured by the pH probe, and from that, the pH value of the liquid is calculated. Knowing the pH value indicates how acidic or basic the liquid is, which is very useful for a lot of science experiments.
pH probe calibration must be done in order to get the correct readings. Calibration is a fancy term that refers to the process of ensuring the probe is working correctly and providing you with accurate readings. Calibrating a glass pH probe involves using two different liquids with known pH values. Acid In this activity one of these liquids must be acidic, 4.0pH, and the other basic, 7.0pH.
So rinse off your probe in clean water just before use to be sure that you are not carrying over liquids from the previous absorption. Gently dry the probe with a clean cloth after rinsing. Afterwards, insert the probe into the pH 7.0 solution. This liquid will be neutral, meaning it its neither acidic nor basic in nature. You have to calibrate the meter (the display indicating the pH value) once so that it will exactly read 7.0. Rinse the probe with clean water again after this step to prepare it for the next calibration step. Then plunge the probe into the pH 4.0 solution. This time, you will set the meter to 4.0. Now after doing all this two steps, your probe is calibrated and ready for use in your experiments!!
Rinsing the probe with clean, distilled water after each use is a good practice. And this will rinse off any liquids that will still remain on it. Rinse off and dry the probe with a cloth or fine blotting. At times, you can also soak the probe in special cleaning solutions intended only for glass pH probes. But always remember that you should never clean your probe with soap and other chemical cleaning products. These substances can melt the glass and alter the operation of the probe, which can lead to reading errors.
For instance, if you notice that your pH readings are way too high or too low, it may mean it is time to recalibrate your probe. This means repeating the calibration steps to make sure the readings are correct. In case your probe has spent a long time in storage without service, it can be dry. Soak it in the reference electrolyte for around 30 minutes and use it again. This will restore its ability to accurately measure pH. When you suspect something odd with your readings that shouldn't necessarily be there, it's because of interference from electronic devices. To fix this, you could try to keep the probe away from things like cell phones, or computers, as they tend to create signals that will confuse it.
Glass pH probes are a very common and accurate way to measure acidity, but there are others that can work too. Litmus paper for instance, is a special paper which turns colour when dipped into an acidic liquid. This color change can give you a general sense if the liquid is acidic or not. Litmus paper is less accurate than a glass pH probe, so this can be used to get a rough estimate of the pH rather than a reliable measurement.
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