The pH of water is a measure of what?

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Answer 1 · 2017-02-01T19:38:12

Of the concentration of the #"hydronium ion........."#

#pH=-log_10[H_3O^+]#

Given the following equilibrium:

#2H_2O(l) rightleftharpoonsH_3O^+ + HO^-#

#K_w=[H_3O^+][HO^-]=10^-14# at #298*K#

#pK_w=-log_10[H_3O^+]-log_10[HO^-]=-log_(10)10^-14#

#+14=pH+pOH#

At neutrality, #[HO^-]=[H_3O^+]#, and #pH=pOH=7.#