Pure water contains?

Question

(a) water molecules only
(b) hydronium ions only
(c) hydroxide ions only
(d) water molecules, hydronium ions, and hydroxide ions

Answer 1

D

Pure water is H2O only, but H2O will ionize to a small degree. Therefore there will be a small amount of both hydronium ions and hydroxide ions mixed in with a huge amount of the water molecules.

Even distilled water (pure water) will have some of the H3O+ and OH- ions mixed with the H2O molecules. Distilled water, or pure water, just means it has no other ions from an outside source mixed in with it.

Answer 2

The correct answer is D. This is because although 99+% of molecules are water, there is still a very insignificantly small amount of hydronium ions and hydroxide ions. You see, water is always trying to maintain equilibrium, just like many other compounds, especially in aqueous solutions. In other words, eventually, those very few hydronium ions and hydroxide ions will turn into water also, and a water molecule will be split into hydroxide ions and hydronium ions also.

But, the presence of hydronium ions and hydroxide ions is insignificant, so I would accept the answer A. But, at the collegiate level, a thorough understanding of equilibrium should be understodd, so D would be the correct answer.

Answer 3

Pure water contains water molecules which when dissociates by electrolysis gives hydronium ions and hydroxide ions. So, we can say that pure water contains all H2O molecule which consist of H3O+ (hydronium ion) and OH- (hydroxide ions).

So, the answer would be D.

Answer 4

pure water is H2O right? 2 parts oxygen ,1 part hydrogen I would say D

Answer 5

A. H2O Add anything else and it's no longer pure water . Just a weak solution

Answer 6

Following link may help you

http://www.permapure.com/TechNotes/Tap%20Water.htm

Answer 7

a

Answer 8

d unless you want distilled water, which is a

Answer 9

it's D, or it's crap.