2006-11-12 08:31:15 · 10 answers · asked by popcorn22 1 in Science & Mathematics ➔ Chemistry
pH is a magnitude of the measure of hydrogen ion (proton) concentration in a solution. The definition of pH is: pH = -log(concentration of hydrogen ions).
2006-11-12 08:35:18 · answer #1 · answered by mg 3 · 0⤊ 0⤋
pH is a logrithmic number (similar to the Richter scale that measures the intensity of earthquakes) that measures the concentration of hydrogen ions (H+) in a solution. The symbol "p" stands for the negative log (base 10) of a particular value. In this case, pH = -log[H+] where the concentration of the hydrogen ion has units of moles/L or molarity. Acidic solutions have pH values from 0-7, basic solutions have pH values from 7-14, and a neutral solution has a pH = 7.0
2006-11-12 16:37:14 · answer #2 · answered by Ravenwoodman 3 · 0⤊ 0⤋
pH is a measure of the acidity of a solution in terms of activity of hydrogen (H+). For dilute solutions, however, it is convenient to substitute the activity of the hydrogen ions with the molarity (mol/L) of the hydrogen ions (however, this is not necessarily accurate at higher concentrations [1][2]).
In aqueous systems, the hydrogen ion activity is dictated by the dissociation constant of water (Kw = 1.011 à 10â14 M2 at 25 °C) and interactions with other ions in solution. Due to this dissociation constant, a neutral solution (hydrogen ion activity equals hydroxide ion activity) has a pH of approximately 7. Aqueous solutions with pH values lower than 7 are considered acidic, while pH values higher than 7 are considered basic.
The concept was introduced by S.P.L. Sørensen in 1909, and is purported to mean pondus hydrogenii in Latin.[3] However, most other sources attribute the name to the French term pouvoir hydrogène.[4][5][6] In English, pH can stand for "hydrogen power,"[4][5][6] "power of hydrogen," [7][8] or "potential of hydrogen."[3][9][10] All of these terms are technically correct.
2006-11-12 16:47:57 · answer #3 · answered by snissari 2 · 0⤊ 0⤋
pH stands for the "power of Hydrogen".
On a scale from 0-14, it is a base 10 scale (as you move from one number to the next, it is 10 times stronger or weaker).
Substances that range below 7 are considered acids (containing an H+ ion).
Substances that range above 7 are considered alkaline or bases (containing an OH- ion).
Substances close to 7 are considered neutral.
The further away from 7 you get, the stronger an acid or base gets.
2006-11-12 16:42:45 · answer #4 · answered by Silas 2 · 0⤊ 0⤋
The small p is a small Greek rho, it means negative log.
The H is hydrogen ions
pH is the negative log of the hydrogen ion concentration
It is a measure of acifity. The low numbers are the most acid. Acid is 1 to 6. Neutral is 7. Basic is 8-14. 14 most basic.
2006-11-12 16:39:46 · answer #5 · answered by science teacher 7 · 0⤊ 0⤋
pH is a measurement of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions. less than 7 is an acid, more than 7 is a base
2006-11-12 16:36:16 · answer #6 · answered by 7 · 0⤊ 0⤋
The pH scale is used to measure the how acidic or basic a substance is.
2006-11-12 16:33:54 · answer #7 · answered by Anonymous · 0⤊ 0⤋
pH is used to measure the hydrogen ion concentration in an aqueous solution
2006-11-12 16:36:12 · answer #8 · answered by jane 62 1 · 0⤊ 0⤋
It is negative log of hydrogen ion concentration in a compound.
2006-11-12 16:37:06 · answer #9 · answered by Dupinder jeet kaur k 2 · 0⤊ 0⤋
pondus hydrogenii or pouvoir hydrogène
2006-11-12 16:34:15 · answer #10 · answered by kscaldef 1 · 0⤊ 0⤋