(Chemistry) potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution. Pure water has a pH of 7, acid solutions have a pH less than 7, and alk...
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Why is pH=7 Neutral in Aqueous Solutions? To see why this should be so, consider the following: Water exists as an equilibrium between molecules and ions: H2O ⇌ H+ + OH- The multiplication product of the concentrations [H+] and [OH-] is a constant; it is water's dissociation const...
AcronymDefinition PHINPublic Health Information Network(CDC) PHINPhilologie Im Netz(German journal) PHINPersonal Health Information Number(Canada) PHINPharmaceutical and Healthcare Industry News(database) PHINPro-Hope International PHINParrot Heads in Need(Westerville, OH) ...
pH is usually to measure acidic or basic water is. pH is a measure of the relative amount of free hydrogen and hydroxyl ions in water. There are 0-14 range to be measure which is 7 is for neutral while pH which less that 7 is acidity and the pH which is greater than 7 is alkali...
that tends to maintain a constanthydrogen ionconcentration.Ionsare atoms or molecules that have lost or gained one or more electrons. An example of a common buffer is a solution ofacetic acid(CH3COOH) and sodium acetate. In water solution, sodium acetate is completely dissociated into sodium (Na...
Definition Word History Entries Near Cite this Entry Share Show less Save Word Caryophanalesplural nounCar·y·oph·a·na·les ˌkarēˌäfəˈnā(ˌ)lēz : a small order of filamentous bacteria that occur in water, decaying organic matter, and the alimentary ...
For most purposes the difference between the two scales for dilute aqueous solutionscan be ignored; it depends on the density of water, and is about 0.001 at 298.15 K risingto 0.02 at 393.15 K.1.2 Operational definition. It is universally agreed that the definition of pH differ-ence is an ...
Mathematical definition of pH is a little less intuitive but more useful in general. It states that the pH equals the negative logarithmic value of the concentration of hydrogen ion (H+) pH = -log [H+] A water source ‘s pH value is a function of its acidity, or alkalinity. The pH ...
7.0: pure water (neutral) 7.4: human blood 13.0: lye 14.0: sodium hydroxide Not All Liquids Have a pH Value A pH value only has meaning in anaqueous solution(in water). Many chemicals, includingliquids, do not havepH values. If there is no water, there is no pH. For example, there...