A solution at 25 degrees Celsius with a pH of 7 contains

a) more H3O+ ions than OH- ions
b) fewer H3O+ ions than OH- ions
c) an equal number or H3O+ ions and OH- ions
d) no H3O+ ions or OH- ions

Question

04-06-2015
Chemistry

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A solution at 25 degrees Celsius with a pH of 7 contains

a) more H3O+ ions than OH- ions
b) fewer H3O+ ions than OH- ions
c) an equal number or H3O+ ions and OH- ions
d) no H3O+ ions or OH- ions

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Stephenlee0912idn Stephenlee0912idn · Answer 1 · 2015-06-04T02:10:27-04:00

Stephenlee0912idn Stephenlee0912idn

04-06-2015

The answer is c. You probably know that a pH of 7 is usually what we call "neutral," meaning no excess of either H+ or OH-. The 25 degrees Celsius is important because the dissociation constant of water is actually dependent upon temperature. The neutral pH is 7 only when the temperature is 25 degrees Celsius, which you should assume that it is unless otherwise stated.

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