# Electronic Components/pH Calculations.

Question

pH Meter
Dear Deirdre

http://en.wikipedia.org/wiki/PH
http://en.wikipedia.org/wiki/PH_meter
http://www.ehow.com/how_4781811_use-ph-meter.html
http://www.bosworthinstrument.com/pH_meters_uses.html
http://www.ehow.com/facts_5011477_what-ph-meter-used.html
http://www.noormd.com/phvj.ppt
http://www.professionalequipment.com/digital%20pH%20meter/related.html

The pH Calculations of different Liquids whether acidic (0 to 6), neutral (7) or alkaline (8 to 14) may vary with different temperatures and results may not be accurate as shown by Digital pH Meter ?

As a example :

Water at 25 degree Celsius is neutral i.e. pH Value is 7, at some other temperature the pH Value may be different.

Thanks & Regards,
Prashant S Akerkar

Actually, the problem isn't that the pH meter doesn't show the correct pH - the problem is that the pH of individual chemicals varies with temperature. For that reason, testing is either done at a specific temperature, or the temperature may be recorded with the pH reading.

One of the problems in measuring pH is that the reactivity of acids will vary with temperature. A properly calibrated pH meter will read correctly, but the solution will have a different pH at different temperatures. You can't simply say that a chemical has a pH of some value - that pH will be dependent upon temperature. One good discussion is here: http://www.newton.dep.anl.gov/askasci/chem00/chem00920.htm
Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment Dear Deirdre Thank you. Thanks & Regards, Prashant S Akerkar

Electronic Components

Volunteer

#### Deirdre Hebert

##### Expertise

I can answer most questions regarding electronic components, what they are and how to use them.

##### Experience

I worked for a number of years in the electronic component testing industry, designing and building automated test equipment for the electronic manufacturing industry.

Publications
Numerous technical manuals for the equipment we built.

Education/Credentials
UNH, CCAF and others

Past/Present Clients
General Electric, Motorola, Ford, Sensonor and others.