A) \[{{10}^{-6}}\]
B) \[{{10}^{-8}}\]
C) \[{{10}^{-12}}\]
D) \[{{10}^{-14}}\] In pure water: \[[{{H}^{+}}]=[O{{H}^{-}}]\] \[{{K}_{w}}=[{{H}^{+}}][O{{H}^{-}}]\] \[{{K}_{w}}={{10}^{-6}}\times {{10}^{-6}}={{10}^{-12}}\]
Correct Answer: C
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