pH meter Use and calibration

53 %
47 %
Information about pH meter Use and calibration
Education

Published on January 9, 2008

Author: Biaggia

Source: authorstream.com

pH Meter - Use and Calibration:  pH Meter - Use and Calibration What is a pH Meter?:  What is a pH Meter? An instrument that measures the H+ ion concentration (pH) of a solution using an ion sensitive electrode which will ideally respond to one specific ion, in this case H+ The pH of a solution is the negative logarithm of the H+ ion concentration A typical modern pH meter has a glass and reference electrode in one tube How Does a pH Meter Measure H+ Concentration?:  How Does a pH Meter Measure H+ Concentration? The pH meter has two electrodes in one tube, glass and reference electrode. A saturated KCL and HCL solution is contained in a tube which is inside of an outer tube that will have contact with the solution to be measured. This outer tube has a double glass bulb with NA+ which makes an ion specific electrode. When measuring the pH of a solution, a salt bridge forms. The NA+ ion, not H+, crosses the glass membrane of the pH electrode and allows for a change in free energy which is measured by the pH meter as the concentration of H+. Calibrating a pH Meter:  Calibrating a pH Meter Make sure the meter is in pH mode For a 3 point calibration, use high pH (--), pH 7.0 and low (-.0) solution Before calibration, rinse probe thoroughly with de-ionized water or a rinse solution Immerse the end of the probe completely in the calibration solution Stir the probe gently to create a homogenous sample Measuring the pH of a Solution:  Measuring the pH of a Solution Always rinse electrodes with de-ionized water prior to placing in a solution for pH measurement Allow meter to stabilize for 30 seconds or a minute, then read Remove electrodes and rinse with de-ionized solution The pH bulb should always be stored wet preferably in pH 4.0 buffer with 1/100 KCl Other buffers or tap water can be used for storage Maintenance of pH Meter:  Maintenance of pH Meter Wipe off exterior of pH meter with a damp cloth after use The outside of the meter is made of polyester and is not affected by most solvents but is affected by some organic solvents pH the “power of hydrogen” Slide7:  Litmus Paper A Quick Method for Determining pH Slide8:  Litmus Paper Litmus paper is useful to determine the pH of a solution when you do not have a pH meter available Proper storage of the litmus paper is essential to maintain quality control Slide9:  The pH Scale The pH measures the concentration of H+ in a solution The lower the number, the more acidic the solution The higher the number, the more basic the solution Slide10:  The pH Scale – Another Description

Add a comment

Related presentations

Related pages

pH Meter Guide: Care and Calibration

Guide to pH Meters: Care and Calibration. ... reason why pH meters need periodic calibration. ... If not use the up and down keys to select pH ...
Read more

pH meter - Wikipedia, the free encyclopedia

A pH Meter is a scientific instrument that measures the hydrogen-ion concentration (or pH) in a solution, indicating its acidity or alkalinity. The pH ...
Read more

How to Calibrate and Use a pH Meter: 14 Steps

How to Calibrate and Use a pH Meter. ... Do Pipette Calibration. How to Measure the pH of Water. Article Info. Categories: Aquariums | Chemistry. In other ...
Read more

pH meter calibration - All about pH

A pH meter calibration is performed by ... If you have stored your electrode, make sure it is ready for use. The main steps for a generic pH ...
Read more

pH Meter Calibration - YouTube

A pH meter must be calibrated before each use to ensure accurate measurements. In this video, our lab technician demonstrates the procedure for ...
Read more

PH Meters: calibration, use and maintenance

Portable and Bench-Top pH Meters Calibration, Use and Maintenance Calibration: The pH meter/electrode (glass/epoxy type) must be calibrated before use with ...
Read more

pH calibration procedure - All about pH

A pH calibration is the procedure of adjusting the pH meter ... More advanced pH meters will let the user ... use the form below to publish your ...
Read more