![\tt 10^{-14}=8.4\times 10^{-11}\times [OH^-]](/tpl/images/0901/4793/b8c57.png)
![\tt [OH^-]=\dfrac{10^{-14}}{8.4\times 10^{-11}}=1.19\times 10^{-4}\approx 1.2\times 10^{-4}](/tpl/images/0901/4793/9a4e7.png)
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