While chemical reagents undergo specific reactions, we need to know the conditions under which the reaction occurs to retrieve optimal results. One such crucial parameter is pH. pH is a factor that expresses the acidity or basicity of a liquid on a logarithmic scale. A pH of seven is neutral, while less than seven is acidic, and more than seven is basic. We use a pH meter for such conducts.
What is a pH Meter?
A pH meter is a scientific tool used to measure the hydrogen-ion activity in solvents to determine whether the solution is basic or acidic to get the appropriate pH measurement. You can use a pH meter for conducting laboratory experiments to quality testing of food, water and soil.
A Crystal-Clear Buying Approach:
The pH meter you opt for should be based on the location you decide to use it for, whether for water testing or food sampling or soil quality control. There are waterproof variants also available to work under specific conditions. Accuracy is yet another crucial factor to consider before buying one. For research and development, one needs a precise instrument compared to demonstrations related to pH conducted for college-level students. The accuracy of a pH meter generally ranges from 0.1 pH to 0.001 pH. Pocket or hand-held variants are light in weight and portable.
More specific the instrument more shall be its cost. Hence, student orientated pH work will require an accuracy of 0.10 pH and will cost lesser than research-based pH projects, which require a 0.01 pH. Calibration plays a pivotal role in deciding the accuracy of the pH meter. You can calibrate it by using buffer solutions to avoid fluctuations in the actual readings. Commonly used buffer solutions are 4, 7 and 10 with colour codes of red, yellow, and blue. There are pH meters of 2-point, 3-point and 5-point calibrations available.
Temperature, A Deciding Factor?
pH meters use electrodes to measure the concentration of hydrogen ions in liquids. Electrodes are immersed into the sample under observation. There are glass bulb and non-glass bulb electrodes to choose from. Non-glass bulbs are used for food testing. Glass bulb electrodes are fragile and need to be replaced from time to time. Temperature has a pivotal role in determining the pH of the sample. Hence, it is best to go for a pH meter that automatically gets calibrated as per the sample's temperature.
Categories Simillar to pH Meters includes Hydrometers, Refractometers