We know that, Ksp of Fe(OH)2="4.87\\times10^{-17}"
pOH= 14-8.36=5.64
"[OH^{-1}]=-log(5.64)=2.291\\times10^{-6}"
"[Fe^{2+}][OH^{-1}]=4.87\\times10^{-17}"
"[Fe^{2+}][2.291\\times10^{-6}]=4.87\\times10^{-17}"
"[Fe^{2+}]=2.12 \\times 10^{-11}"
Above this it will make buffer
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