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Topic: PH

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In the News (Thu 21 Mar 19)

The pH of distilled water is 7, this is neutral.
The pH scale was invented a long time ago and sometime it seems a little silly that the more acid it is the lower the pH is. Really it is quite easy.
So to recap if the pH is low, it means that there is a high concentration of Hydrogen ions and if the pH is high it means that there is very low concentration of Hydrogen ions or none at all.
www.purchon.com /chemistry/ph.htm   (648 words)

  PH - Wikipedia, the free encyclopedia
Though pH is generally expressed without units, it is not an arbitrary scale; the number arises from a definition based on the activity of hydrogen ions in the solution.
The pH scale is a reverse logarithmic representation of relative hydrogen proton (H+) concentration.
The formula for pH was derived from the application of the Nernst Equation to concentration cells, or galvanic cells where the half cells are at different concentrations.
en.wikipedia.org /wiki/PH   (1400 words)

 EPA > OWOW > Monitoring and Assessing Water Quality > Volunteer Stream Monitoring: A Methods Manual > ...
pH is a term used to indicate the alkalinity or acidity of a substance as ranked on a scale from 1.0 to 14.0.
A pH meter consists of a potentiometer, which measures electric current; a glass electrode, which senses the electric potential where it meets the water sample; a reference electrode, which provides a constant electric potential; and a temperature compensating device, which adjusts the readings according to the temperature of the sample (since pH varies with temperature).
Measure the pH of the 4.01 and 7.0 buffers periodically to ensure that the meter is not drifting off calibration.
www.epa.gov /owow/monitoring/volunteer/stream/vms54.html   (1228 words)

 Simply Hydroponics - pH
pH is measured on a scale of 1-14 with 7 being "neutral".
The pH scale is logarithmic, which means that each unit of change equals a ten fold change in the hydrogen/hydroxyl ion concentration.
This means that when you are adjusting the pH of your nutrient solution and you need to move it 2 points (example: 7.5 to 5.5) you would have to use 10 times more adjuster than if you were moving the pH value just 1 point (7.5 to 6.5).
www.simplyhydro.com /ph.htm   (1286 words)

 .ph - Wikipedia, the free encyclopedia
Sometime in 2000, PH domains were marketed for a time as a mnemonic for the phone (other similar ccTLDs marketed in this fashion are.fm,.am, and.tv).
ICANN has since approved the new.mobi domain (in 2005) and there is a current prevalence of applications which allow fund transfers between mobile subscribers.
After a series of public consultations conducted through the NTC in 2004, the "Guidelines in the Administration of the.Ph Domain Name" was issued by the CICT in November 2004.
en.wikipedia.org /wiki/.ph   (719 words)

 Ph scale, Ph measurement and ph parameters. Different types of Ph meter
Even natural seawater (pH = 8.0 to 8.3) isn't going to be optimal for every creature living in it, but it was recognized more than eighty years ago that moving away from the pH of natural seawater (down to 7.3, for example) is stressful to fish.
Consequently, the ranges of pH that are acceptable in one aquarium may be different in other aquaria, even for the same organisms.
If you are going to push the pH to 8.4 or higher (as often happens in an aquarium using limewater), make sure that both the calcium and alkalinity levels are suitably maintained (that is, neither too low, inhibiting biological calcification, nor too high, causing excessive abiotic precipitation on equipment).
vpmt.com /ph-scale.htm   (1054 words)

 pHion Nutrition - pH Balance, Acid Alkaline Diet For Vibrant Health
Plants need the pH of the soil in which they live to be perfect in order to flourish.
It means that you have excess energy, a clear mind, a radiant glow, and a body that operates in a peak state.
Vasey's specialization is pH balance, detoxification and rejuvenation.
www.ph-ion.com   (740 words)

 pH of Drinking Water Water Balance
The technical definition of pH is that it is a measure of the activity of the hydrogen ion (H+) and is reported as the reciprocal of the logarithm of the hydrogen ion activity.
The measurement of alkalinity and pH is needed to determine the corrosivity of the water.
The pH of the water is not a measure of the strength of the acidic or basic solution and alone does not provide a full picture of the characteristics or limitations with the water supply.
www.water-research.net /pH.htm   (384 words)

 pH definition - Medical Dictionary definitions of popular medical terms
The pH may range from 0 to 14, where 0 is most acid, 14 most basic, and 7 is neutral.
Mathematically, the pH is the logarithm (to the base 10) of the reciprocal of the hydrogen ion concentration, [H+].
The pH is approximately equal to the negative logarithm of the H+ ion concentration expressed in molarity.
www.medterms.com /script/main/art.asp?articlekey=32704   (170 words)

 Water on the Web | Understanding | Water Quality | Parameters | pH
Ability of a solution to resist changes in ph when acids or bases are added; the buffering capacity of natural waters is mostly due to dissolved carbonate rocks in the basin; equivalent to acid neutralizing capacity (anc).
Although these small changes in pH are not likely to have a direct impact on aquatic life, they greatly influence the availability and solubility of all chemical forms in the lake and may aggravate nutrient problems.
Instead, pH should be reported as a median and range of values; alternatively the values could be converted to hydrogen ion concentrations, averaged, and re-converted to pH values.
waterontheweb.org /under/waterquality/ph.html   (1444 words)

 Suburban Water Testing Labs: NewSplash!
"pH," written with a lower case "p" and a capital "H," is the negative logarithm of the effective hydrogen-ion concentration.
The pH scale goes from 0 to 14, with a pH of 7 generally considered neutral.
If you drink water with a pH of 5, it will cause no health problems since a can of carbonated soda may be 10 to 100 times more acidic.
www.h2otest.com /swtlph.html   (389 words)

 pH -an index of Hydrogen's chemical activity in a solution -The degree of Acidity of a Substance
pH is a Log Scale Unit of Measure, and is used to express the degree of acidity of a substance.
The pH or acidity of a solution is important throughout all phases of chemistry and biochemistry.
The pH of a river or lake is important in maintaining a proper ecological balance.
www.luminet.net /~wenonah/hydro/ph.htm   (3089 words)

 General Chemistry Online: FAQ: Acids and bases: What is pH?
pH is a logarithmic measure of hydrogen ion concentration, originally defined by Danish biochemist Søren Peter Lauritz Sørensen in 1909 [1].
A pH of 7 is considered "neutral", because the concentration of hydrogen ions is exactly equal to the concentration of hydroxide (OH) ions produced by dissociation of the water.
For example, a solution of pH 1 is said to be 10 times as acidic as a solution of pH 2, because the hydrogen ion concentration at pH 1 is ten times the hydrogen ion concentration at pH 2.
antoine.frostburg.edu /chem/senese/101/acidbase/faq/what-is-pH.shtml   (560 words)

 Soil pH   (Site not responding. Last check: )
Soil pH is a measurement of the acidity or alkalinity of a soil.
Soil pH is an important chemical property because it affects the availability of nutrients to plants and the activity of soil microorganisms.
The soil type, present pH, and the desired pH are used to determine the amount of elemental sulfur needed, (see Table 3).
www.ext.colostate.edu /pubs/garden/07727.html   (1025 words)

 BASIN: General Information on pH
pH is defined as the negative logarithm of the activity of H
The pH of water can be measured with a pH meter, which is an electronic device with a probe.
The term "pH" was originally derived from the French term "pouvoir hydrogène," in English, this means "hydrogen power." The term pH is always written with a lower case p and an upper case H. Select here for a list references used in the preparation of this information
bcn.boulder.co.us /basin/data/NUTRIENTS/info/pH.html   (960 words)

 pH - The Global Water Sampling Project   (Site not responding. Last check: )
A pH level between 5.5-5.9 or 8.1-8.5 is considered to be fair.
If the water's pH level is less than 5.5 it is very acidic and is at a level where fish and other organisms may find it impossible to survive.
A pH level greater than 8.6 is considered to be very alkaline and this is not good either.
www.k12science.org /curriculum/waterproj/ph.shtml   (326 words)

The importance of maintaining optimum pH is therefore a critical factor in balancing proper internal terrain to deter cancer, infection, and a host of inflammatory disease.
Salivary pH is a fair indicator of health for extracellular fluids and their alkaline mineral reserves.
The pH of the urine is an indication as to how well the body is working to maintain a proper pH of the blood.
www.drlam.com /opinion/print/ph.htm   (1127 words)

 Soil pH: What it Means
Soil pH or soil reaction is an indication of the acidity or alkalinity of soil and is measured in pH units.
Soil pH is defined as the negative logarithm of the hydrogen ion concentration.
To determine the average soil pH of a field or lawn it is necessary to collect soil from several locations and combine into one sample.
www.esf.edu /pubprog/brochure/soilph/soilph.htm   (839 words)

 eMailman(sm) -- Ph servers
If you tell Ph to default to one of the servers that maintains a complete list of Ph servers, you can then scroll through the list nicely within Ph to choose which one to query.
JavaPH is a client used for querying PH servers - distributed as a free, open source, cross platform, lightweight, app/applet.
Thus you can have your regular Ph server entered as your usual Ph host, yet enter one of the ones that maintains a list of known Ph servers for use when clicking the globe.
www.emailman.com /ph   (1431 words)

 Chemistry and the Aquarium
If a mineral acid were the cause of a pH drop (like hydrochloric acid), then the carbonate alkalinity (and the total alkalinity as well) will have crashed.
High pH problems in reef tanks are most frequently encountered when using limewater, but are also sometimes encountered when using other high pH alkalinity supplements, such as the original version of B-ionic.
In an acute high pH situation (such as 5 gallons of limewater entering the tank and sending the pH over 9), adding an acid such as vinegar, muriatic acid (HCl or hydrochloric acid) or sulfuric acid are all acceptable ways to lower the pH.
www.advancedaquarist.com /issues/june2002/chem.htm   (3600 words)

 pH Water Quality Information   (Site not responding. Last check: )
pH is a measure of the acidic or basic (alkaline) nature of a solution.
The concentration of the hydrogen ion [H+] activity in a solution determines the pH.
The pH value is the negative power to which 10 must be raised to equal the hydrogen ion concentration.
www.state.ky.us /nrepc/water/wcpph.htm   (229 words)

 The Environmental Literacy Council - pH scale & Acid Rain
The pH scale is used to classify substances.
A pH of 7 is directly in the middle and represents neutral.
Logarithmically, a change from a pH of 6 to 5 is increasing acidity by 10 times, while a change from 6 to 4 represents acidity increasing 100 times greater.
www.enviroliteracy.org /article.php/426.html   (567 words)

M. The pH concept makes use of this relationship to describe both dilute acid and dilute base solutions on a single scale.
As the pH of a solution decreases by one pH unit, the concentration of H
As the pH of a solution increases by one pH unit, the concentration of OH increases by ten times.
www.mpcfaculty.net /mark_bishop/pH_equilibrium.htm   (1292 words)

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