What is the relation between pure water and acid-base balance?

a. A solution with an OH? concentration greater than that of water acts as an acid.
b. Pure water is slightly acidic solution.
c. The concentrations of both H+ and OH? ions are equal.
d. The H+ concentration of water can be designated as 1 nmol/L.

ANS: C
The concentration of both H+ and OH− in pure water is 10-7 mol/L.