what is pH???

Question

doing biology and it all goes in 1 ear n out da other what is pH?

Answer 1

pH is a measure of the acidity or basicity of a solution

Answer 2

pH is a measure of the activity of hydrogen ions (H+) in a solution and, therefore, its acidity or alkalinity. The pH value is a number without units, usually between 0 and 14, that indicates whether a solution is acidic (pH 7).

where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic

Answer 3

pH is a logarithmic measure of hydrogen ion concentration, originally defined by Danish biochemist Søren Peter Lauritz Sørensen in 1909 [1].

pH = -log[H+]

where log is a base-10 logarithm and [H+] is the concentration of hydrogen ions in moles per liter of solution. According to the Compact Oxford English Dictionary, the "p" stands for the German word for "power", potenz, so pH is an abbreviation for "power of hydrogen" [2].

The pH scale was defined because the enormous range of hydrogen ion concentrations found in aqueous solutions make using H+ molarity awkward. For example, in a typical acid-base titration, [H+] may vary from about 0.01 M to 0.0000000000001 M. It is easier to write "the pH varies from 2 to 13".

The hydrogen ion concentration in pure water around room temperature is about 1.0 × 10-7 M. 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. Increasing the concentration of hydrogen ions above 1.0 × 10-7 M produces a solution with a pH of less than 7, and the solution is considered "acidic". Decreasing the concentration below 1.0 × 10-7 M produces a solution with a pH above 7, and the solution is considered "alkaline" or "basic".

Answer 4

pH is a measure of the concentration of hydrogens ions (= H+) (= protons) in a solution.

Numerically it is the negative logarithm of that concentration expressed in moles per liter (M).

Pure water spontaneously dissociates into ions, forming a 10-7 M solution of H+ (and OH-). The negative of this logarithm is 7, so the pH of pure water is 7.

Solutions with a higher concentration of H+ than occurs in pure water have pH values below 7 and are acidic.

Solutions containing molecules or ions that reduce the concentration of H+ below that of pure water have pH values above 7 and are basic or alkaline.

Is pH important? Yes!

The properties of most proteins, enzymes for example, are sensitive to pH.

As the pH drops,
H+ bind to the carboxyl groups (COO-) of aspartic acid (Asp) and glutamic acid (Glu), neutralizing their negative charge, and
H+ bind to the unoccupied pair of electrons on the N atom of the amino (NH2 ) groups of lysine (Lys) and arginine (Arg) giving them a positive charge.
The result: Not only does the net charge on the molecule change (it becomes more positive) but many of the opportunities that its R groups have for ionic (electrostatic) interactions with other molecules and ions are altered.

As the pH rises,

Answer 5

how acidic a solution is or alkali
7 is usually neutral and anything below 7 is acidic.
Anything above 7 is an alkali...

Answer 6

pH is the level of acidic in one substance.