What is the concentration of hydroxide ions in a solution that has a pH of 6.0?

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Answer 1 · 2017-03-11T04:39:06

#[HO^-]=10^-8*mol*L^-1#..........

We know that water undergoes self-ionization, which we may represent by the following reaction:

#H_2O rightleftharpoons H^+ + HO^-#

This equilibrium has been carefully measured, and at #298*K#, we may write,

#[H^+][HO^-]=10^-14#, and taking #log_10# of both sides,

#log_10[H_3O^+]+log_10[HO^-]=-14#

#-log_10[H_3O^+]-log_10[HO^-]=+14#

Given the definition of #pH=-log_10[H^+]#, then...........

#pH+pOH=14#

So if #pH=6#, then #pOH=8# and #[HO^-]=10^-8*mol*L^-1#.