"pH=-log_{10}[H^{+}]"
"pH+pOH=14"
1) "pH= -log_{10}[1.9\u00d710^{-8}]=7.7"
"pOH=14-7.7= 6.3"
2) "pH= -log_{10}[1.0\u00d710^{-7}]=7"
"pOH=14-pOH=14-7=7"
3) "pH=-log_{10}[2.3\u00d710^{-6}]=5.6"
"pOH=14-5.6=8.4"
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