please help im really stuck

When species combine to produce a coordination complex, the equilibrium constant for the reaction is called is the formation constant, Kf. For example, the iron(II) ion, Fe2+, can combine with the cyanide ion, CN, to form the complex [Fe(CN)6]4 according to the equation Fe2+(aq)+6CN(aq)[Fe(CN)6]4(aq) where Kf=4.211045. This reaction is what makes cyanide so toxic to human beings and other animals. The cyanide ion binds to the iron that red blood cells use to carry oxygen around the body, thus interfering with the blood's ability to deliver oxygen to the tissues. It is this toxicity that has made the use of cyanide in gold mining controversial. Most states now ban the use of cyanide in leaching gold out of low-grade ore. The average human body contains 5.80L of blood with a Fe2+ concentration of 2.30105M. If a person ingests 8.00 mL of 10.0mMNaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion? Express the percentage numerically. The solubility-product constant for Zn(OH)2 is Ksp=3.001016. The formation constant for the hydroxo complex, Zn(OH)42, is Kf=4.601017. When Zn(OH)2(s) was added to 1.00L of a basic solution, 1.30102mol of the solid dissolved. What is the concentration of OHin the final solution? Express your answer with the appropriate units