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Answer 1 · 2017-08-10T17:55:13

At pH 7 the amount of acid ions is exactly equal to the amount of basic ions.

At pH 7 the #H^+# concentration is # 10^-7#

pH is the negative log of the hydrogen ion concentration so

the antilog of # 10^-7 is 7

Kw for water is # 10^-14.#

# 10^-14 =( H^+ xx OH^-)/ (H^2O)#

The concentration of water #H_2O# is one. so

# 10^-14 = H^+ xx OH^- #

if # H^+ = 10^-7# Then

# 10^-14 = 10^-7 xx OH^-1# Dividing both sides by # 10^-7#

# (10^-14)/(10^-7) = #OH# so

# 10^-7 = OH^-1#

So when the # H^+ # concentration is # 10^-7# The #OH^-1# concentration is also # 10^-7#

At pH 7 the concentration of acid and base are equal