Acidity and alkalinity of aqueous solutions are axpressed in terms of pH. This is a measurement of the hydrogen ion concentration of the solution. Mathematically it is expressed as:
abbreviation: an indicator of the acidity or alkalinity of a substance of solution, represented on a scale of 0-14, 0-6.9 being acidic, 7 being neither acidic or basic (i.e., neutral), and 7.1-14 being basic. These values are based on hydrogen ion content and activity.
A scale running from 1 to 14 and used to measure whether a soil is acid, (below pH 7) neutral (pH 7) or alkaline (above pH 7). Most garden soils are within the range of 4.5 to 8
is a way of expressing the acidity, or alkalinity of an aqueous solution, based on the concentration of hydrogen ions. pH 0 corresponds to a 1 Normal acid solution (1 gram of hydrogen ions per litre). pH 7 corresponds to a neutral solution, with equal concentrations of hydrogen and hydroxyl ions and pH 14 corresponds to a 1 Normal alkali solution (17 grams of hydroxyl ions per litre). As the scale is logarithmic, an increase of one unit corresponds to a ten-fold reduction of the hydrogen ion and a ten-fold increase in the hydroxyl ion....
(Humans as organisms) scale of acidity/alkalinity. pH below 7 = acidic, pH above 7 = alkaline
Negative logarithm of the concentration (mol/L) of the H
3O
+[H
+] ion; scale is commonly used over a range 0 to 14.
Found on http://www.encyclo.co.uk/local/10003
The scale where the acidity and alkalinity of soil is measured. It starts at '1' for acid and goes to '14' for alkali. Most gardens will fall between 5.5
Found on http://www.encyclo.co.uk/local/20077
An expression of the intensity of the basic or acid condition of a liquid; may range from 0 to 14, where 0 is the most acid and 7 is neutral. Natural waters usually have a pH between 6.5 and 8.5.
Found on http://www.epa.gov/OCEPAterms/
Measure of he acidity or basicity of water (-log10 of the activity of hydrogen ions in water)
Found on http://life.bio.sunysb.edu/marinebio/glossary.opq.html
pH is related to hydrogen ion concentration. Since the H
+ ion concentration in solution is often small, the concentration is generally expressed as the logarithm of its reciprocal, which is called a pH value. Therefore, pH is defined as
pH = -log[H
+]
For a ten times increase in H
+ ion concentration there is a ...
Found on http://www.avogadro.co.uk/definitions/ph.htm
This abbreviation is short for the potency, or concentration, of hydrogen. It is used to measure the acidity or alkalinity of soil, compost or water.You can test the soil with a with a simple kit, which gives a pH reading from 0 to 14. A value of pH 7.0, that of pure water, is neutral. Higher readings indicate higher alkalinity, or levels of lime. ...
Found on http://www.bbc.co.uk/gardening/htbg/glossary/ph.shtml
a measure of how acid or alkali a solution is. As the pH gets lower, the solution is more acid. At a pH of 7 the solution is neither acid nor alkali. pH is the inverse of the logarithm of the concentration of hydrogen ions.
Found on http://www.encyclo.co.uk/local/20169
[
n] - (chemistry) p(otential of) H(ydrogen)
Found on http://www.webdictionary.co.uk/definition.php?query=pH
Remember using litmus paper at school? This measures pH, which is a scale for assessing acidity. The lower the pH (red litmus paper), the higher the acidity; neutral pH is 7 (green litmus paper) and higher than 7 is alkaline or basic (blue litmus paper). Most wines have a pH of between 3 and 4, so they are acidic. Nowadays, the use of litmus paper ...
Found on http://www.surf4wine.co.uk/glossary.html
The acidity index of the soil. Various crops perform better at optimum ph so certain crops may be suited to particular fields or areas. ph may be raised (more alkaline) by the application of ground limestone.
Found on http://www.lethamshank.co.uk/glossary/glossary.php?letter=P
stands for potential of hydrogen, which is a measure of how acid or alkaline a liquid is. Pure water has a pH value of 7; acids are less than 7; and alkalines are more than 7. See also under Protein.
Found on http://www.bcpa.co.uk/glossary.htm
a logarithmic scale (0-14) that reflects acidity or alkalinity; pH 7 indicates neutrality; acidic solutions have lower pH values; alkaline solutions have higher values
Found on http://www.oasisenviro.co.uk/Glossary%20N%20to%20R.htm
A measure of the alkalinity or acidity of a medium. Neutral is represented by 7; with lower figures indicating increased acidity and higher figures, increased alkalinity.
Found on http://www.encyclo.co.uk/local/20637
A measure of acidity or alkalinity, pH 7 is neutral, increasing acidity is expressed as a number less than 7; increasing alkalinity as a number greater than 7. The normal pH of blood plasma is 7.35-7.45.
Found on http://www.felpress.co.uk/Exercise_Physiology_Glossary.24.0.html
is the scale for all liquid chemicals. Acids and alkalis are the chemicals at each end of the pH spectrum. The scale runs from 0 (acid) to 14 (alkali). At both ends the chemicals are very reactive and corrosive, but in between or mixed together they become neutral. The most neutral chemical is water, pH 7
Found on http://www.epaw.co.uk/EPT/glossary.html
An acronym for 'potential hydrogen' a measure of acidity. The lower the pH, the higher the acidity.However pH is actually a shorthand for its mathematical approximation: in chemistry a small p is used in place of writing - log10 and the H here represents [H+], the concentration of hydrogen ions.
Found on http://www.encyclo.co.uk/local/20673
Measures the acidity of a solution. It is the negative logarithm of the concentrationof the hydrogen ions in a substance. If the hydrogen ion concentration of asolution is 1x10
-n mol litre
-1, then the pH of the solution is n.The lower the pH, the more acid the solution. A pH of 7 corresponds to a neutral solution.pH0 hydrochlo...
Found on http://www.diracdelta.co.uk/science/source/p/h/ph/source.html
Negative logarithm of the concentration (mol/L) of the H
3O
+[H
+] ion, scale is commonly used over a range 0 to 14.
Found on http://www.encyclo.co.uk/local/20728
pH is a convenient measure of the acid-base character of a solution, usually defined by pH = -logc(H+) where c(H+) is the concentration of hydrogen ions in moles per liter. The more precise definition is in terms af activity rather than concentration. A solution of pH 0 to 7 is acid, pH of 7 is neutral, pH over 7 to 14 is alkaline.
Found on http://www.ktf-split.hr/periodni/en/abc/p.html
the negative logarithm of the hydrogen ion concentration (-log10[H+]) where H+ is the hydrogen-ion concentration in moles per liter. Neutral water has a pH value of 7.
Found on http://www.chemicalglossary.net/definition/1240-PH
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