The hydroxide ion concentration, [OH-] : 6.31 x 10⁻⁹ M
pH=- log [H⁺]
pH+pOH= 14
A hydrogen ion concentration of [H"]=1.7 x 10⁻⁶ M
[tex]\tt pH=-log[1.7\times 10^{-6}]\\\\pH=6-log~1.7\\\\pH=5.8[/tex]
[tex]\tt 5.8+pOH=14\\\\pOH=8.2\\\\ (OH^-)=10^{-8.2}=6.31\times 10^{-9}[/tex]