The pH of water is a measure of what?

1 Answer
Feb 1, 2017

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.