2006-09-09 05:07:10 · 41 answers · asked by shreyas 1 in Science & Mathematics ➔ Physics
Simply put the pH of pure water is 7. All acids have a pH that is lower than 7 and all bases have a pH that is higher than 7. But why is water the reference point for pH?
As you might know, water is not considered to be an acid or a base. It is neutral. This can be seen if we look at the chemical formula of water when compared with acids/bases.
Acids such as HCl, HNO3, and H2SO4 have a positively charged hydrogen atoms combined with a negatively charged ions:
H+ + Cl- = HCl
Bases such as NaOH and KOH usually have a positively charged ions combined with negatively charged hydroxide ions:
Na+ + (OH)- = NaOH
Water or H20 can also be described by the chemical formula HOH. Water can be viewed as a positively charged ion (hydrogen) combined with a negatively charged polyatomic ion (hydroxide).
H+ + (OH)- = HOH = water!
As you can see, water has the chemical formula of an acid and a base. Instead of acting as both, water displays the characteristics of a neutral substance, as acid and base cancel each other out.
2006-09-09 05:14:23 · answer #1 · answered by Anonymous · 3⤊ 0⤋
7
2006-09-09 05:31:52 · answer #2 · answered by mastani 1 · 0⤊ 0⤋
7
2006-09-09 05:20:37 · answer #3 · answered by abc 2 · 0⤊ 0⤋
7
2006-09-09 05:12:52 · answer #4 · answered by bangles121 4 · 0⤊ 0⤋
7
2006-09-09 05:08:52 · answer #5 · answered by Anonymous · 0⤊ 0⤋
7
2006-09-09 05:08:04 · answer #6 · answered by friscoboy 2 · 0⤊ 0⤋
PH depends upon the balance of Hydrogen (ions) to OH hydoxyl radicals (ions) if there is a 1 to 1 correlation you have pure water which is also an insulator. An exact 1 to 1 relation is what we call PH7 and it varies logrithmetically powers of 10 either side of 7. If you go to 6 there is 10 Hydrogen to each Hydroxyl and if you go to 8 there is 10 Hydroxyl to each Hydrogen. The water is considered acid if lower than 7 and Alkali if greater than 7. Liquid Water is considered to be in a dissociated state where H and OH are seperated. In this dissociated state you can have an imbalace in the numbers of whatever which makes water corrosive and puts other things into solution. It is all quite interesting and i know only a tiny bit about it.
2006-09-09 05:17:43 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Water can be either acidic or alkalinic. Most water plants in the country try to get it to be neutral, that is pH of 7.
2006-09-09 06:54:08 · answer #8 · answered by sherrylboodramhot 2 · 0⤊ 0⤋
Pure water has a pH of 7.00; however, depending on the source, the pH may vary. Mineral water may be more alkaline.(pH >7) Some other samples may be more acidic.(pH<7)
2006-09-09 05:43:22 · answer #9 · answered by wind 4 · 0⤊ 0⤋
ph of water is 7.
2006-09-09 05:25:30 · answer #10 · answered by aqua 3 · 0⤊ 0⤋