2006-09-08 07:14:23 · 13 answers · asked by smartie1967 1 in Science & Mathematics ➔ Other - Science
A pH of 7 is neutral.
To correct "NLS" and "sonpari2004",....
Any value greater than 7 is alkaline ("basic") and any value less than 7 is acidic.
The pH scale is continuous, it is certainly possible to have a pH of 6.5 or 7.1 or 6.999995, it does not necessarily need to be whole number digits to be acidic or alkaline.
pH is calculated as the negative logarithm of the molar concentration of Hydronium ions (H+ or H3O+) in aqueous solution,
pH = -log ([H+])
When the pH < 7, there are more H+ ions in solution than OH- ions. When pH > 7, there is an excess of OH- to H+ in solution.
Water will naturally break up to a degree into H+ and OH- ions,
H2O (l) --> H+ (aq) + OH- (aq)
but in a neutral solution, there are equal numbers of both H+ and OH- ions, so it all balances. Solutions become acidic when something upsets this balance for whatever reason.
2006-09-08 07:46:16 · answer #1 · answered by mrjeffy321 7 · 2⤊ 0⤋
7
2006-09-08 08:34:20 · answer #2 · answered by kissmysta 2 · 1⤊ 0⤋
7
2006-09-08 07:55:01 · answer #3 · answered by rajesh 2 · 1⤊ 0⤋
Depends on the temperature. For 25 C it is 7.
At different temperatures the equilibrium constant for the self dissociation of water (Kw) changes.
Neutrality is at pH=0.5pKw where pKw=-logKw
At 25 C Kw=10^-14, pKw=14 and neutrality at pH=0.5*14= 7
2006-09-09 04:42:35 · answer #4 · answered by bellerophon 6 · 0⤊ 0⤋
It's 7
2006-09-08 07:18:10 · answer #5 · answered by Daniel L 2 · 1⤊ 1⤋
neutral pH is 7
pH 7 means that substance is neither an acid or alkali. (it has the same number of H+ and OH- ions)
2006-09-08 08:50:14 · answer #6 · answered by konrad 2 · 0⤊ 0⤋
7.0 is neutral. Higher is increasingly alkaline, lower is increasing acidic. Its possible to have a negative pH, and a pH greater than 14.
2006-09-08 07:54:04 · answer #7 · answered by davidosterberg1 6 · 0⤊ 0⤋
7 is considered neutral on the pH scale, but when you start messing with stuff it gets more complex. Like water is considered to be anywhere from 7.2 to 7.8.
2006-09-08 07:21:56 · answer #8 · answered by beachdarryl0202 2 · 0⤊ 0⤋
7 is for neutral
eg.Water.
6 and below is an Acid
8 and above is an Alkali
2006-09-08 07:43:28 · answer #9 · answered by Anonymous · 0⤊ 1⤋
7
6 and below is an ACID
8 and above is an Alkali
2006-09-08 07:19:59 · answer #10 · answered by NLS 2 · 0⤊ 1⤋