The pH of water is a measure of what?

1 Answer
Feb 1, 2017

Answer:

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

Explanation:

#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.#