Hydronium ions and water

Question

A solution is known to have a hydronium ion concentration of 1.0*10^-6 M. What percentage of the total H3O+ ion concentration comes from the dissociation of water?

 

a. 1%

b. 3%

c. 5%

d. 10%

e. 100%

Answer 1

Dissociation of water yields a hydronium ion concentration of 1x10-7, so % from water is

10-7/10-6 (x100%) = 10%